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 c997275..dda7303 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
@@ -40,7 +40,6 @@
 
             }
         };
-        registrationRepository.getAccountObservable().addObserver(observer);
     }
 
     @Override
@@ -53,8 +52,14 @@
     }
 
     @Override
-    public void onDestroy() {
-        super.onDestroy();
+    public void onResume() {
+        super.onResume();
+        registrationRepository.getAccountObservable().addObserver(observer);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
         registrationRepository.getAccountObservable().removeObserver(observer);
     }
 
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 8c08de5..e697a7c 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
@@ -43,13 +43,18 @@
                 viewContract.showShortToast("ルーム作成に失敗しました");
             }
         };
-        this.roomRepository.getCreateRoomObservable().addObserver(observer);
     }
 
     @Override
-    public void onDestroy() {
-        super.onDestroy();
-        this.roomRepository.getCreateRoomObservable().removeObserver(observer);
+    public void onResume() {
+        super.onResume();
+        roomRepository.getCreateRoomObservable().addObserver(observer);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        roomRepository.getCreateRoomObservable().removeObserver(observer);
     }
 
     public void onClickCreate(String userName, String pass) {
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 9d4acff..8b67b42 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
@@ -78,24 +78,23 @@
                 viewContract.showShortToast("入室に失敗しました");
             }
         };
-
-        this.roomRepository.getRoomListObservable().addObserver(roomListObserver);
-        this.roomRepository.getEnterRoomObservable().addObserver(enterRoomObserver);
     }
 
     @Override
     public void onResume() {
         super.onResume();
-        this.roomRepository.getRooms();
+        roomRepository.getRoomListObservable().addObserver(roomListObserver);
+        roomRepository.getEnterRoomObservable().addObserver(enterRoomObserver);
+        roomRepository.getRooms();
     }
 
     @Override
-    public void onDestroy() {
-        super.onDestroy();
+    public void onPause() {
+        super.onPause();
         roomRepository.getRoomListObservable().removeObserver(roomListObserver);
+        roomRepository.getEnterRoomObservable().removeObserver(enterRoomObserver);
     }
 
-
     public void onClickRefresh() {
         roomRepository.getRooms();
     }
diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomMainViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomMainViewModel.java
index bcf5163..13e7089 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomMainViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/RoomMainViewModel.java
@@ -36,12 +36,13 @@
     public RoomMainViewModel(RoomRepository roomRepository, RoomMainAdapter adapter, ViewContract viewContract) {
         this.roomRepository = roomRepository;
         this.viewContract = viewContract;
+        this.adapter = adapter;
 
         roomObserver = new Observer<Room>() {
             @Override
             public void notify(Room room) {
                 ArrayList<Member> items = new ArrayList<>(room.getMemberList().values());
-                adapter.setDataAndRefresh(items);
+                RoomMainViewModel.this.adapter.setDataAndRefresh(items);
             }
 
             @Override
@@ -73,16 +74,19 @@
                 throwable.printStackTrace();
             }
         };
-
-        this.adapter = adapter;
-        this.roomRepository.getRoomObservable().addObserver(roomObserver);
-        this.roomRepository.getRoomUpdateStateObservable().addObserver(updateRoomStateObserver);
-        this.roomRepository.getExitRoomObservable().addObserver(exitRoomObserver);
     }
 
     @Override
-    public void onDestroy() {
-        super.onDestroy();
+    public void onResume() {
+        super.onResume();
+        roomRepository.getRoomObservable().addObserver(roomObserver);
+        roomRepository.getRoomUpdateStateObservable().addObserver(updateRoomStateObserver);
+        roomRepository.getExitRoomObservable().addObserver(exitRoomObserver);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
         roomRepository.getRoomObservable().removeObserver(roomObserver);
         roomRepository.getRoomUpdateStateObservable().removeObserver(updateRoomStateObserver);
         roomRepository.getExitRoomObservable().removeObserver(exitRoomObserver);