diff --git a/app/src/main/java/com/example/sprout/refactor/activity/RoomCreateActivity.java b/app/src/main/java/com/example/sprout/refactor/activity/RoomCreateActivity.java
index 4d853aa..e03f763 100644
--- a/app/src/main/java/com/example/sprout/refactor/activity/RoomCreateActivity.java
+++ b/app/src/main/java/com/example/sprout/refactor/activity/RoomCreateActivity.java
@@ -1,15 +1,10 @@
 package com.example.sprout.refactor.activity;
 
-import android.content.Intent;
 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.databinding.RfActivityRoomCreateBinding;
-import com.example.sprout.refactor.common.ActivityEvent;
-import com.example.sprout.refactor.contract.ViewContract;
 import com.example.sprout.refactor.viewmodel.RoomCreateViewModel;
 
 /**
@@ -17,38 +12,29 @@
  *
  * @author matsumoto_k
  */
-public class RoomCreateActivity extends AppCompatActivity implements ViewContract {
+public class RoomCreateActivity extends BaseActivity {
+
+    private RoomCreateViewModel roomCreateViewModel = null;
+    private RfActivityRoomCreateBinding binding = null;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        RfActivityRoomCreateBinding binding = DataBindingUtil.setContentView(this, R.layout.rf_activity_room_create);
-        RoomCreateViewModel roomCreateViewModel = new RoomCreateViewModel((ViewContract) this);
+        binding = DataBindingUtil.setContentView(this, R.layout.rf_activity_room_create);
+        roomCreateViewModel = new RoomCreateViewModel();
         binding.setViewModel(roomCreateViewModel);
         getLifecycle().addObserver(roomCreateViewModel);
     }
 
     @Override
-    public void startActivity(ActivityEvent event) {
-        switch (event) {
-            case ROOM_MAIN:
-                startActivity(new Intent(RoomCreateActivity.this, RoomMainActivity.class));
-                break;
-        }
+    protected void onResume() {
+        super.onResume();
+        addUiObserver(roomCreateViewModel);
     }
 
     @Override
-    public void finishActivity() {
-        finish();
-    }
-
-    @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();
+    protected void onPause() {
+        super.onPause();
+        removeUiObserver(roomCreateViewModel);
     }
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/model/RoomResponseModel.java b/app/src/main/java/com/example/sprout/refactor/model/RoomResponseModel.java
index 1f72130..e2b6858 100644
--- a/app/src/main/java/com/example/sprout/refactor/model/RoomResponseModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/model/RoomResponseModel.java
@@ -7,9 +7,9 @@
 import com.example.sprout.refactor.util.PreferenceUtil;
 
 /**
+ * RoomResponseを管理するクラス
  * Created by matsumoto_k on 2017/12/22.
  */
-
 public class RoomResponseModel {
 
     private RoomRepository roomRepository = null;
@@ -38,6 +38,10 @@
         roomRepository.enterRoom(roomId, userId);
     }
 
+    public void createRoom(int userId, String roomName, String key) {
+        roomRepository.createRoom(userId, roomName, key);
+    }
+
     public Observable<RoomResponse> getRoomResponseObservable() {
         return roomResponseObservable;
     }
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomCreateViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomCreateViewModel.java
index 72ec0c1..bf69eba 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomCreateViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomCreateViewModel.java
@@ -3,12 +3,13 @@
 import android.databinding.ObservableBoolean;
 import android.databinding.ObservableField;
 
-import com.example.sprout.refactor.common.ActivityEvent;
-import com.example.sprout.refactor.contract.ViewContract;
+import com.example.sprout.refactor.activity.RoomMainActivity;
+import com.example.sprout.refactor.messengers.NavigationMessage;
+import com.example.sprout.refactor.messengers.ToastMessage;
 import com.example.sprout.refactor.model.ModelLocator;
+import com.example.sprout.refactor.model.RoomResponseModel;
 import com.example.sprout.refactor.model.entity.RoomResponse;
 import com.example.sprout.refactor.notification.Observer;
-import com.example.sprout.refactor.repository.RoomRepository;
 import com.example.sprout.refactor.util.PreferenceUtil;
 
 /**
@@ -18,31 +19,27 @@
  */
 public class RoomCreateViewModel extends BaseViewModel {
 
-    private RoomRepository roomRepository = null;
-    private ViewContract viewContract = null;
+    //    private RoomRepository roomRepository = null;
+//    private ViewContract viewContract = null;
+    private RoomResponseModel roomResponseModel = ModelLocator.get().getRoomResponseModel();
     private ObservableField<String> roomName = new ObservableField<>("");
     private ObservableField<String> pass = new ObservableField<>("");
     private ObservableBoolean hasPass = new ObservableBoolean(false);
     private Observer<RoomResponse> observer = null;
 
-    public RoomCreateViewModel(ViewContract viewContract) {
-        this.roomRepository = ModelLocator.getModel(ModelLocator.Tag.ROOM_REPOSITORY, RoomRepository.class);
-        this.viewContract = viewContract;
+    public RoomCreateViewModel() {
 
         observer = new Observer<RoomResponse>() {
             @Override
             public void notify(RoomResponse roomResponse) {
-                ModelLocator.setModel(ModelLocator.Tag.RoomResponse, roomResponse);
-                PreferenceUtil.getInstance().saveInt(PreferenceUtil.Key.ROOM_ID, roomResponse.getRoom().getRoomId());
-                PreferenceUtil.getInstance().saveInt(PreferenceUtil.Key.MEMBER_ID, roomResponse.getMemberId());
-                viewContract.showShortToast("ルームを作成しました");
-                viewContract.startActivity(ActivityEvent.ROOM_MAIN);
-                viewContract.finishActivity();
+                toastObservable.notifyObservers(new ToastMessage("ルームを作成しました", ToastMessage.Length.SHORT));
+                navigationObservable.notifyObservers(new NavigationMessage(NavigationMessage.Type.Start, RoomMainActivity.class));
+                navigationObservable.notifyObservers(new NavigationMessage(NavigationMessage.Type.Finish));
             }
 
             @Override
             public void error(Throwable throwable) {
-                viewContract.showShortToast("ルーム作成に失敗しました");
+                toastObservable.notifyObservers(new ToastMessage("ルーム作成に失敗しました", ToastMessage.Length.SHORT));
             }
         };
     }
@@ -50,33 +47,33 @@
     @Override
     public void onResume() {
         super.onResume();
-        roomRepository.getRoomResponseObservable().addObserver(observer);
+        roomResponseModel.getRoomResponseObservable().addObserver(observer);
     }
 
     @Override
     public void onPause() {
         super.onPause();
-        roomRepository.getRoomResponseObservable().removeObserver(observer);
+        roomResponseModel.getRoomResponseObservable().addObserver(observer);
     }
 
     public void onClickCreate(String userName, String pass) {
         if (hasPass.get()) {
             if (userName.isEmpty() || pass.isEmpty()) {
-                viewContract.showShortToast("必要項目を入力して下さい");
+                toastObservable.notifyObservers(new ToastMessage("必須項目を入力して下さい", ToastMessage.Length.SHORT));
                 return;
             }
-            roomRepository.createRoom(PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID), userName, pass);
+            roomResponseModel.createRoom(PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID), userName, pass);
         } else {
             if (userName.isEmpty()) {
-                viewContract.showShortToast("必要項目を入力して下さい");
+                toastObservable.notifyObservers(new ToastMessage("必須項目を入力して下さい", ToastMessage.Length.SHORT));
                 return;
             }
-            roomRepository.createRoom(PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID), userName, null);
+            roomResponseModel.createRoom(PreferenceUtil.getInstance().getInt(PreferenceUtil.Key.USER_ID), userName, null);
         }
     }
 
     public void onClickBack() {
-        viewContract.finishActivity();
+        navigationObservable.notifyObservers(new NavigationMessage(NavigationMessage.Type.Finish));
     }
 
     public ObservableField<String> getRoomName() {