diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
index c2b107c..b2c0c75 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
@@ -4,6 +4,13 @@
 import android.arch.lifecycle.LifecycleObserver;
 import android.arch.lifecycle.OnLifecycleEvent;
 
+import com.example.sprout.refactor.messengers.NavigationMessage;
+import com.example.sprout.refactor.messengers.NavigationMessenger;
+import com.example.sprout.refactor.messengers.ToastMessage;
+import com.example.sprout.refactor.messengers.ToastMessenger;
+
+import io.reactivex.Observable;
+
 /**
  * Base ViewModel
  *
@@ -11,6 +18,9 @@
  */
 public abstract class BaseViewModel implements LifecycleObserver {
 
+    protected ToastMessenger toastMessanger = new ToastMessenger();
+    protected NavigationMessenger navigationMessenger = new NavigationMessenger();
+
     @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
     public void onCreate() {
     }
@@ -34,4 +44,13 @@
     @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
     public void onDestroy() {
     }
+
+
+    public Observable<ToastMessage> getToastMessanger() {
+        return toastMessanger.getObservable();
+    }
+
+    public Observable<NavigationMessage> getNavigationMessenger() {
+        return navigationMessenger.getObservable();
+    }
 }
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RegistrationViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RegistrationViewModel.java
index 2d94e8f..9520708 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RegistrationViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/RegistrationViewModel.java
@@ -6,14 +6,11 @@
 import com.example.sprout.Sprout;
 import com.example.sprout.refactor.activity.RoomListActivity;
 import com.example.sprout.refactor.messengers.NavigationMessage;
-import com.example.sprout.refactor.messengers.NavigationMessenger;
 import com.example.sprout.refactor.messengers.ToastMessage;
-import com.example.sprout.refactor.messengers.ToastMessenger;
 import com.example.sprout.refactor.model.ModelLocator;
 import com.example.sprout.refactor.model.RegistrationModel;
 import com.example.sprout.refactor.util.PreferenceUtil;
 
-import io.reactivex.Observable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
 
@@ -26,22 +23,30 @@
 
     private ObservableField<String> editUserName = new ObservableField<>("");
     private RegistrationModel registrationModel = ModelLocator.get().getRegistrationModel();
-    private ToastMessenger toastMessanger = new ToastMessenger();
-    private NavigationMessenger navigationMessenger = new NavigationMessenger();
     private PreferenceUtil preferenceUtil = PreferenceUtil.getInstance();
     private CompositeDisposable subscriptions = new CompositeDisposable();
 
     public RegistrationViewModel() {
-        // 既にアカウント登録されていたらされていたらルーム一覧に画面遷移する
-        if (preferenceUtil.getBoolean(PreferenceUtil.Key.REGISTERED, false)) {
-            navigationMessenger.navigateTo(new NavigationMessage(NavigationMessage.Type.Start, RoomListActivity.class));
-            navigationMessenger.navigateTo(new NavigationMessage(NavigationMessage.Type.Finsih));
-        }
     }
 
     @Override
     public void onResume() {
         super.onResume();
+        // 既にアカウント登録されていたらされていたらルーム一覧に画面遷移する
+        if (preferenceUtil.getBoolean(PreferenceUtil.Key.REGISTERED, false)) {
+            navigationMessenger.navigateTo(new NavigationMessage(NavigationMessage.Type.Start, RoomListActivity.class));
+            navigationMessenger.navigateTo(new NavigationMessage(NavigationMessage.Type.Finsih));
+        }
+        subscribe();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        dispose();
+    }
+
+    private void subscribe() {
         subscriptions.add(
                 registrationModel.getAccountObservable()
                         .observeOn(AndroidSchedulers.mainThread())
@@ -63,9 +68,7 @@
         );
     }
 
-    @Override
-    public void onPause() {
-        super.onPause();
+    private void dispose() {
         subscriptions.dispose();
     }
 
@@ -86,12 +89,4 @@
     public ObservableField<String> getEditUserName() {
         return editUserName;
     }
-
-    public Observable<ToastMessage> getToastMessanger() {
-        return toastMessanger.getObservable();
-    }
-
-    public Observable<NavigationMessage> getNavigationMessenger() {
-        return navigationMessenger.getObservable();
-    }
 }