diff --git a/app/src/main/java/com/example/sprout/refactor/Constant.java b/app/src/main/java/com/example/sprout/refactor/Constant.java
index 91c9712..e517600 100644
--- a/app/src/main/java/com/example/sprout/refactor/Constant.java
+++ b/app/src/main/java/com/example/sprout/refactor/Constant.java
@@ -5,7 +5,7 @@
  */
 
 public class Constant {
-    public static final boolean DEVELOP = false;
+    public static final boolean DEVELOP = true;
     public static final long ROOM_UPDATE_INTERVAL = 333; // ms
     public static final long ROOM_UPDATE_DELAY = 50; // ms
 }
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 5a01115..821b7b4 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
@@ -33,6 +33,10 @@
     Call<RoomResponse> enterRoom(@Path("roomId") int roomId, @Field("userId") int userId);
 
     @FormUrlEncoded
+    @PUT("rooms/{roomId}")
+    Call<RoomResponse> enterRoomWithKey(@Path("roomId") int roomId, @Field("userId") int userId, @Field("key") String key);
+
+    @FormUrlEncoded
     @POST("rooms")
     Call<RoomResponse> createRoom(@Field("userId") int userId, @Field("roomName") String roomName, @Field("key") String key);
 
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 cfd6d01..9d567b4 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
@@ -24,6 +24,7 @@
     private Observable<Room> roomObservable = new Observable<>();
     private Observable<RoomResponse> roomUpdateStateObservable = new Observable<>();
     private Observable<Void> exitRoomObservable = new Observable<>();
+    private Observable<RoomResponse> enterRoomWithKeyObservable = new Observable<>();
 
     public RoomRepository(SproutService sproutService) {
         this.sproutService = sproutService;
@@ -143,6 +144,25 @@
         });
     }
 
+    public void enterRoomWithKey(int roomId, int userId, String key) {
+        Call<RoomResponse> task = sproutService.enterRoomWithKey(roomId, userId, key);
+        task.enqueue(new Callback<RoomResponse>() {
+            @Override
+            public void onResponse(Call<RoomResponse> call, Response<RoomResponse> response) {
+                if (response.isSuccessful()) {
+                    enterRoomWithKeyObservable.notifyObservers(response.body());
+                } else {
+                    enterRoomWithKeyObservable.notifyError(new Throwable("error"));
+                }
+            }
+
+            @Override
+            public void onFailure(Call<RoomResponse> call, Throwable t) {
+                enterRoomWithKeyObservable.notifyError(t);
+            }
+        });
+    }
+
     public Observable<Rooms> getRoomListObservable() {
         return roomListObservable;
     }
@@ -163,6 +183,10 @@
         return roomUpdateStateObservable;
     }
 
+    public Observable<RoomResponse> getEnterRoomWithKeyObservable() {
+        return enterRoomWithKeyObservable;
+    }
+
     public Observable<Void> getExitRoomObservable() {
         return exitRoomObservable;
     }
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomInputKeyViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomInputKeyViewModel.java
index 7b61bd4..672b702 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomInputKeyViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomInputKeyViewModel.java
@@ -1,7 +1,13 @@
 package com.example.sprout.refactor.viewmodel;
 
+import android.databinding.ObservableField;
+
+import com.example.sprout.refactor.common.ActivityEvent;
 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.RoomResponse;
 
 /**
  * ルーム入室(key)のViewModel
@@ -12,9 +18,59 @@
 
     private RoomRepository roomRepository = null;
     private ViewContract viewContract = null;
+    private ObservableField<String> pass = new ObservableField<>("");
+    private Observer<RoomResponse> observer = null;
 
     public RoomInputKeyViewModel(RoomRepository roomRepository, ViewContract viewContract) {
         this.roomRepository = roomRepository;
         this.viewContract = viewContract;
+
+        observer = new Observer<RoomResponse>() {
+            @Override
+            public void notify(RoomResponse roomResponse) {
+                if (roomResponse.canEnter()) {
+                    viewContract.startActivity(ActivityEvent.ROOM_MAIN);
+                } 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");
+            }
+        };
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        roomRepository.getEnterRoomWithKeyObservable().addObserver(observer);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        roomRepository.getEnterRoomWithKeyObservable().removeObserver(observer);
+    }
+
+    public void onClickEnter(String pass) {
+        if (pass.isEmpty()) {
+            viewContract.showShortToast("パスワードを入力して下さい");
+        } else {
+            roomRepository.enterRoomWithKey(
+                    PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.ROOM_ID),
+                    PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID),
+                    pass
+            );
+        }
+    }
+
+    public void onClickBack() {
+        viewContract.finishActivity();
+    }
+
+    public ObservableField<String> getPass() {
+        return pass;
     }
 }
diff --git a/app/src/main/res/layout/rf_activity_room_input_key.xml b/app/src/main/res/layout/rf_activity_room_input_key.xml
index 03d4d89..cfbd450 100644
--- a/app/src/main/res/layout/rf_activity_room_input_key.xml
+++ b/app/src/main/res/layout/rf_activity_room_input_key.xml
@@ -8,9 +8,29 @@
             type="com.example.sprout.refactor.viewmodel.RoomInputKeyViewModel" />
     </data>
 
-    <android.support.constraint.ConstraintLayout
+    <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="match_parent">
+        android:layout_height="match_parent"
+        android:orientation="vertical">
 
-    </android.support.constraint.ConstraintLayout>
+        <EditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/password"
+            android:text="@={viewModel.pass}" />
+
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:enabled="@{!viewModel.pass.get().isEmpty()}"
+            android:onClick="@{() -> viewModel.onClickEnter(viewModel.pass.get())}"
+            android:text="@string/enter_room" />
+
+        <Button
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:onClick="@{() -> viewModel.onClickBack()}"
+            android:text="@string/back" />
+
+    </LinearLayout>
 </layout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 6f6a652..af42757 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -22,5 +22,6 @@
     <string name="create">作成</string>
     <string name="password">パスワード</string>
     <string name="room_name">ルーム名</string>
+    <string name="enter_room">入室</string>
 
 </resources>