diff --git a/app/src/main/java/com/example/sprout/refactor/activity/RoomListActivity.java b/app/src/main/java/com/example/sprout/refactor/activity/RoomListActivity.java
index 8871446..2284c06 100644
--- a/app/src/main/java/com/example/sprout/refactor/activity/RoomListActivity.java
+++ b/app/src/main/java/com/example/sprout/refactor/activity/RoomListActivity.java
@@ -3,11 +3,14 @@
 import android.databinding.DataBindingUtil;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
+import android.widget.Toast;
 
 import com.example.sprout.R;
 import com.example.sprout.Sprout;
 import com.example.sprout.databinding.RfActivityRoomListBinding;
 import com.example.sprout.refactor.adapter.RoomListAdapter;
+import com.example.sprout.refactor.common.ActivityEvent;
+import com.example.sprout.refactor.contract.ViewContract;
 import com.example.sprout.refactor.viewmodel.RoomListViewModel;
 
 /**
@@ -15,14 +18,34 @@
  *
  * @author matsumoto_k
  */
-public class RoomListActivity extends AppCompatActivity {
+public class RoomListActivity extends AppCompatActivity implements ViewContract {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         RfActivityRoomListBinding binding = DataBindingUtil.setContentView(this, R.layout.rf_activity_room_list);
-        RoomListViewModel roomMainViewModel = new RoomListViewModel(Sprout.get().getRoomRepository(), new RoomListAdapter(this));
+        RoomListViewModel roomMainViewModel = new RoomListViewModel(Sprout.get().getRoomRepository(), new RoomListAdapter(this), (ViewContract) this);
         binding.setViewModel(roomMainViewModel);
         getLifecycle().addObserver(roomMainViewModel);
     }
+
+    @Override
+    public void startActivity(ActivityEvent event) {
+
+    }
+
+    @Override
+    public void finishActivity() {
+
+    }
+
+    @Override
+    public void showShortToast(String message) {
+        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
+    }
+
+    @Override
+    public void showLongToast(String message) {
+        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
+    }
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/adapter/RoomListAdapter.java b/app/src/main/java/com/example/sprout/refactor/adapter/RoomListAdapter.java
index f6877bd..569bd73 100644
--- a/app/src/main/java/com/example/sprout/refactor/adapter/RoomListAdapter.java
+++ b/app/src/main/java/com/example/sprout/refactor/adapter/RoomListAdapter.java
@@ -8,7 +8,7 @@
 
 import com.example.sprout.R;
 import com.example.sprout.databinding.RfItemRoomListBinding;
-import com.example.sprout.refactor.viewmodel.RoomListItemViewModel;
+import com.example.sprout.refactor.vo.Room;
 
 import java.util.ArrayList;
 
@@ -20,10 +20,12 @@
 public class RoomListAdapter extends RecyclerView.Adapter<RoomListAdapter.ViewHolder> {
 
     private Context context = null;
-    private ArrayList<RoomListItemViewModel> items = new ArrayList<>();
+    private OnItemClickedListener listener = null;
+    private ArrayList<Room> items = new ArrayList<>();
 
     public RoomListAdapter(Context context) {
         this.context = context;
+        setHasStableIds(true);
     }
 
     @Override
@@ -34,7 +36,10 @@
 
     @Override
     public void onBindViewHolder(ViewHolder holder, int position) {
-        holder.binding.setViewModel(items.get(position));
+        holder.binding.setRoom(items.get(position));
+        holder.binding.getRoot().setOnClickListener(view -> {
+            listener.onItemClicked(items.get(position));
+        });
     }
 
     @Override
@@ -42,12 +47,28 @@
         return items.size();
     }
 
-    public void setDataAndRefresh(ArrayList<RoomListItemViewModel> items) {
+    public void setDataAndRefresh(ArrayList<Room> items) {
         this.items.clear();
         this.items.addAll(items);
+        for (Room room : items) {
+            System.out.println(room.getRoomId());
+        }
         notifyDataSetChanged();
     }
 
+    @Override
+    public long getItemId(int position) {
+        return items.get(position).getRoomId();
+    }
+
+    public void setListener(OnItemClickedListener listener) {
+        this.listener = listener;
+    }
+
+    public interface OnItemClickedListener {
+        public void onItemClicked(Room room);
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder {
         RfItemRoomListBinding binding = null;
 
diff --git a/app/src/main/java/com/example/sprout/refactor/api/SproutService.java b/app/src/main/java/com/example/sprout/refactor/api/SproutService.java
index 28c1088..d71ea03 100644
--- a/app/src/main/java/com/example/sprout/refactor/api/SproutService.java
+++ b/app/src/main/java/com/example/sprout/refactor/api/SproutService.java
@@ -1,6 +1,7 @@
 package com.example.sprout.refactor.api;
 
 import com.example.sprout.refactor.vo.Account;
+import com.example.sprout.refactor.vo.RoomResponse;
 import com.example.sprout.refactor.vo.Rooms;
 
 import retrofit2.Call;
@@ -8,6 +9,8 @@
 import retrofit2.http.FormUrlEncoded;
 import retrofit2.http.GET;
 import retrofit2.http.POST;
+import retrofit2.http.PUT;
+import retrofit2.http.Path;
 
 /**
  * Sproutのapi一覧
@@ -22,4 +25,8 @@
 
     @GET("rooms")
     Call<Rooms> getRooms();
+
+    @FormUrlEncoded
+    @PUT("rooms/{roomId}")
+    Call<RoomResponse> enterRoom(@Path("roomId") int roomId, @Field("userId") int userId);
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java b/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
index 658cdc9..7a3768b 100644
--- a/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
+++ b/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
@@ -27,7 +27,11 @@
         task.enqueue(new Callback<Account>() {
             @Override
             public void onResponse(Call<Account> call, Response<Account> response) {
-                accountObservable.notifyObservers(response.body());
+                if (response.isSuccessful()) {
+                    accountObservable.notifyObservers(response.body());
+                } else {
+                    accountObservable.notifyError(new Throwable("error"));
+                }
             }
 
             @Override
diff --git a/app/src/main/java/com/example/sprout/refactor/repository/RoomRepository.java b/app/src/main/java/com/example/sprout/refactor/repository/RoomRepository.java
index c468051..51ad4f5 100644
--- a/app/src/main/java/com/example/sprout/refactor/repository/RoomRepository.java
+++ b/app/src/main/java/com/example/sprout/refactor/repository/RoomRepository.java
@@ -2,6 +2,7 @@
 
 import com.example.sprout.refactor.api.SproutService;
 import com.example.sprout.refactor.notification.Observable;
+import com.example.sprout.refactor.vo.RoomResponse;
 import com.example.sprout.refactor.vo.Rooms;
 
 import retrofit2.Call;
@@ -17,6 +18,7 @@
 
     private SproutService sproutService = null;
     private Observable<Rooms> roomListObservable = new Observable<>();
+    private Observable<RoomResponse> enterRoomObservable = new Observable<>();
 
     public RoomRepository(SproutService sproutService) {
         this.sproutService = sproutService;
@@ -27,7 +29,11 @@
         task.enqueue(new Callback<Rooms>() {
             @Override
             public void onResponse(Call<Rooms> call, Response<Rooms> response) {
-                roomListObservable.notifyObservers(response.body());
+                if (response.isSuccessful()) {
+                    roomListObservable.notifyObservers(response.body());
+                } else {
+                    roomListObservable.notifyError(new Throwable("error"));
+                }
             }
 
             @Override
@@ -37,7 +43,30 @@
         });
     }
 
+    public void enterRoom(int roomId, int userId) {
+        Call<RoomResponse> task = sproutService.enterRoom(roomId, userId);
+        task.enqueue(new Callback<RoomResponse>() {
+            @Override
+            public void onResponse(Call<RoomResponse> call, Response<RoomResponse> response) {
+                if (response.isSuccessful()) {
+                    enterRoomObservable.notifyObservers(response.body());
+                } else {
+                    enterRoomObservable.notifyError(new Throwable("error"));
+                }
+            }
+
+            @Override
+            public void onFailure(Call<RoomResponse> call, Throwable t) {
+                enterRoomObservable.notifyError(t);
+            }
+        });
+    }
+
     public Observable<Rooms> getRoomListObservable() {
         return roomListObservable;
     }
+
+    public Observable<RoomResponse> getEnterRoomObservable() {
+        return enterRoomObservable;
+    }
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListItemViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListItemViewModel.java
deleted file mode 100644
index 9676cf6..0000000
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListItemViewModel.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package com.example.sprout.refactor.viewmodel;
-
-import android.databinding.ObservableBoolean;
-import android.databinding.ObservableField;
-
-/**
- * ルーム一覧のアイテムのViewModel
- *
- * @author matsumoto_k
- */
-public class RoomListItemViewModel {
-
-    private ObservableField<String> userName = new ObservableField<>("");
-    private ObservableField<String> roomName = new ObservableField<>("");
-    private ObservableField<String> roomMemberNum = new ObservableField<>("");
-    private ObservableBoolean hasKey = new ObservableBoolean(false);
-
-    public RoomListItemViewModel(String userName, String roomName, int roomMemberNum, boolean hasKey) {
-        this.userName.set(userName);
-        this.roomName.set(roomName);
-        this.roomMemberNum.set(String.valueOf(roomMemberNum));
-        this.hasKey.set(hasKey);
-    }
-
-    public ObservableField<String> getUserName() {
-        return userName;
-    }
-
-    public ObservableField<String> getRoomName() {
-        return roomName;
-    }
-
-    public ObservableField<String> getRoomMemberNum() {
-        return roomMemberNum;
-    }
-
-    public ObservableBoolean getHasKey() {
-        return hasKey;
-    }
-}
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListViewModel.java
index 07db160..91366ac 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomListViewModel.java
@@ -7,13 +7,16 @@
 import android.widget.LinearLayout;
 
 import com.example.sprout.refactor.adapter.RoomListAdapter;
+import com.example.sprout.refactor.contract.ViewContract;
 import com.example.sprout.refactor.notification.Observer;
 import com.example.sprout.refactor.repository.RoomRepository;
+import com.example.sprout.refactor.util.PreferenceUtil;
 import com.example.sprout.refactor.vo.Room;
+import com.example.sprout.refactor.vo.RoomResponse;
 import com.example.sprout.refactor.vo.Rooms;
 
 import java.util.ArrayList;
-import java.util.Map;
+import java.util.Collections;
 
 /**
  * ルーム一覧のViewModel
@@ -22,26 +25,32 @@
  */
 public class RoomListViewModel extends BaseViewModel {
 
-    private RoomListAdapter adapter = null;
-    private Observer<Rooms> observer = null;
     private RoomRepository roomRepository = null;
+    private RoomListAdapter adapter = null;
+    private ViewContract viewContract = null;
+    private RoomListAdapter.OnItemClickedListener listener = null;
+    private Observer<Rooms> roomListObserver = null;
+    private Observer<RoomResponse> enterRoomObserver = null;
 
-    public RoomListViewModel(RoomRepository roomRepository, RoomListAdapter adapter) {
+    public RoomListViewModel(RoomRepository roomRepository, RoomListAdapter adapter, ViewContract viewContract) {
         this.roomRepository = roomRepository;
+        this.viewContract = viewContract;
+
+        this.listener = room -> {
+            if (room.hasKey()) {
+                // TODO input key
+            } else {
+                roomRepository.enterRoom(room.getRoomId(), PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID));
+            }
+        };
+        adapter.setListener(listener);
         this.adapter = adapter;
 
-        observer = new Observer<Rooms>() {
+        roomListObserver = new Observer<Rooms>() {
             @Override
             public void notify(Rooms rooms) {
-                ArrayList<RoomListItemViewModel> items = new ArrayList<>();
-                for (Map.Entry<Integer, Room> entry : rooms.getRoomList().entrySet()) {
-                    items.add(new RoomListItemViewModel(
-                            entry.getValue().getHostName(),
-                            entry.getValue().getRoomName(),
-                            entry.getValue().getMemberList().size(),
-                            entry.getValue().isKeyCheck()
-                    ));
-                }
+                ArrayList<Room> items = new ArrayList<>(rooms.getRoomList().values());
+                Collections.reverse(items);
                 RoomListViewModel.this.adapter.setDataAndRefresh(items);
             }
 
@@ -50,7 +59,25 @@
                 throwable.printStackTrace();
             }
         };
-        this.roomRepository.getRoomListObservable().addObserver(observer);
+
+        enterRoomObserver = new Observer<RoomResponse>() {
+            @Override
+            public void notify(RoomResponse roomResponse) {
+                if (roomResponse.canEnter()) {
+                    // TODO createRoomMainActivity
+                } else {
+                    viewContract.showShortToast("入室に失敗しました");
+                }
+            }
+
+            @Override
+            public void error(Throwable throwable) {
+                viewContract.showShortToast("入室に失敗しました");
+            }
+        };
+
+        this.roomRepository.getRoomListObservable().addObserver(roomListObserver);
+        this.roomRepository.getEnterRoomObservable().addObserver(enterRoomObserver);
         this.roomRepository.getRooms();
     }
 
@@ -61,12 +88,12 @@
     @Override
     public void onDestroy() {
         super.onDestroy();
-        roomRepository.getRoomListObservable().removeObserver(observer);
+        roomRepository.getRoomListObservable().removeObserver(roomListObserver);
     }
 
     @BindingAdapter("setRoomListAdapter")
     public static void setRoomListAdapter(RecyclerView recyclerView, RoomListAdapter adapter) {
-        recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
+        recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext(), LinearLayoutManager.VERTICAL, false));
         DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
                 LinearLayout.VERTICAL);
         recyclerView.addItemDecoration(dividerItemDecoration);
diff --git a/app/src/main/java/com/example/sprout/refactor/vo/Account.java b/app/src/main/java/com/example/sprout/refactor/vo/Account.java
index 0d73f3d..4335698 100644
--- a/app/src/main/java/com/example/sprout/refactor/vo/Account.java
+++ b/app/src/main/java/com/example/sprout/refactor/vo/Account.java
@@ -1,7 +1,7 @@
 package com.example.sprout.refactor.vo;
 
 /**
- * Rアカウント登録のEntity
+ * アカウント登録のEntity
  *
  * @author matsumoto_k
  */
diff --git a/app/src/main/java/com/example/sprout/refactor/vo/Room.java b/app/src/main/java/com/example/sprout/refactor/vo/Room.java
index 44cbd2c..68217c4 100644
--- a/app/src/main/java/com/example/sprout/refactor/vo/Room.java
+++ b/app/src/main/java/com/example/sprout/refactor/vo/Room.java
@@ -5,9 +5,10 @@
 import java.util.HashMap;
 
 /**
- * Created by matsumoto_k on 2017/11/29.
+ * ルームのEntity
+ *
+ * @author matsumoto_k
  */
-
 public class Room {
 
     private int roomId = -1;
@@ -54,4 +55,13 @@
     public int getBattleId() {
         return battleId;
     }
+
+    /**
+     * この部屋にkeyが設定されているかどうか
+     *
+     * @return keyが設定されていればtrue
+     */
+    public boolean hasKey() {
+        return keyCheck;
+    }
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/vo/RoomResponse.java b/app/src/main/java/com/example/sprout/refactor/vo/RoomResponse.java
new file mode 100644
index 0000000..20c8464
--- /dev/null
+++ b/app/src/main/java/com/example/sprout/refactor/vo/RoomResponse.java
@@ -0,0 +1,39 @@
+package com.example.sprout.refactor.vo;
+
+/**
+ * 入室時のEntity
+ *
+ * @author matsumoto_k
+ */
+public class RoomResponse {
+
+    private Room room = null;
+    private int memberId = -1;
+    private int BattleId = -1;
+    private boolean check = false;
+
+    public Room getRoom() {
+        return room;
+    }
+
+    public int getMemberId() {
+        return memberId;
+    }
+
+    public int getBattleId() {
+        return BattleId;
+    }
+
+    public boolean isCheck() {
+        return check;
+    }
+
+    /**
+     * 入室可能かどうか
+     *
+     * @return 入室可能ならtrue
+     */
+    public boolean canEnter() {
+        return check;
+    }
+}
diff --git a/app/src/main/java/com/example/sprout/refactor/vo/Rooms.java b/app/src/main/java/com/example/sprout/refactor/vo/Rooms.java
index 2a8860f..9cf7f9e 100644
--- a/app/src/main/java/com/example/sprout/refactor/vo/Rooms.java
+++ b/app/src/main/java/com/example/sprout/refactor/vo/Rooms.java
@@ -1,16 +1,18 @@
 package com.example.sprout.refactor.vo;
 
 
-import java.util.HashMap;
+import java.util.TreeMap;
 
 /**
- * Created by matsumoto_k on 2017/11/29.
+ * ルームのEntity
+ *
+ * @author matsumoto_k
  */
 
 public class Rooms {
 
     private int roomId = -1;
-    private HashMap<Integer, Room> roomList = null;
+    private TreeMap<Integer, Room> roomList = null;
 
     public Rooms() {
 
@@ -20,7 +22,7 @@
         return roomId;
     }
 
-    public HashMap<Integer, Room> getRoomList() {
+    public TreeMap<Integer, Room> getRoomList() {
         return roomList;
     }
 }
diff --git a/app/src/main/res/layout/rf_item_room_list.xml b/app/src/main/res/layout/rf_item_room_list.xml
index e6740f7..cea67d4 100644
--- a/app/src/main/res/layout/rf_item_room_list.xml
+++ b/app/src/main/res/layout/rf_item_room_list.xml
@@ -5,13 +5,14 @@
     <data>
 
         <variable
-            name="viewModel"
-            type="com.example.sprout.refactor.viewmodel.RoomListItemViewModel" />
+            name="room"
+            type="com.example.sprout.refactor.vo.Room" />
     </data>
 
     <android.support.constraint.ConstraintLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
+        android:layout_height="wrap_content"
+        android:background="?android:attr/selectableItemBackground">
 
         <TextView
             android:id="@+id/room_list_item_room_name"
@@ -19,7 +20,7 @@
             android:layout_height="wrap_content"
             android:layout_marginStart="@dimen/margin_tiny"
             android:layout_marginTop="@dimen/margin_tiny"
-            android:text="@{viewModel.roomName}"
+            android:text="@{room.roomName}"
             android:textSize="@dimen/text_medium"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
@@ -31,7 +32,7 @@
             android:layout_marginBottom="@dimen/margin_tiny"
             android:layout_marginStart="@dimen/margin_tiny"
             android:layout_marginTop="@dimen/margin_tiny"
-            android:text="@{viewModel.userName}"
+            android:text="@{room.hostName}"
             android:textSize="@dimen/text_medium"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintStart_toStartOf="parent"
@@ -42,7 +43,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginEnd="@dimen/margin_tiny"
-            android:text="@{viewModel.roomMemberNum}"
+            android:text="@{String.valueOf(room.memberList.size())}"
             android:textSize="@dimen/text_large"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@id/room_list_item_member_limit"
@@ -53,7 +54,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginEnd="@dimen/margin_large"
-            android:text="/4"
+            android:text="/2"
             android:textSize="@dimen/text_large"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@id/room_list_item_key"
@@ -66,7 +67,7 @@
             android:layout_marginBottom="@dimen/margin_tiny"
             android:layout_marginEnd="@dimen/margin_tiny"
             android:layout_marginTop="@dimen/margin_tiny"
-            android:src="@{viewModel.hasKey.get() ? @drawable/key_close:@drawable/key_open}"
+            android:src="@{room.keyCheck ? @drawable/key_close:@drawable/key_open}"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent" />