diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/ChatViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/ChatViewModel.java
index 8022d53..85a9391 100644
--- a/app/src/main/java/com/example/tampopo_client/viewmodels/ChatViewModel.java
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/ChatViewModel.java
@@ -124,8 +124,10 @@
         try {
             Response<Chatroom> response = call.execute();
             if (response.isSuccessful() && response.body() != null) {
+                Log.d("OK","OK");
                 return response.body().getChatRoomId();
             } else {
+                Log.d("Flase","Flase");
                 return null;
             }
         } catch (IOException e) {
@@ -182,7 +184,7 @@
     // 2. メッセージ送信
     // ===============================
     public void sendMessage(String chatroomId, String senderId, String message, String token) {
-        Call<ChatMessage> call = chatroomResource.sendMessage(token, chatroomId, senderId, message);
+        Call<ChatMessage> call = chatroomResource.sendMessage(chatroomId, senderId, message, token);
         call.enqueue(new Callback<ChatMessage>() {
             @Override
             public void onResponse(Call<ChatMessage> call, Response<ChatMessage> response) {
diff --git a/app/src/main/java/com/example/tampopo_client/views/ChatActivity.java b/app/src/main/java/com/example/tampopo_client/views/ChatActivity.java
index ee83d6a..890aaf2 100644
--- a/app/src/main/java/com/example/tampopo_client/views/ChatActivity.java
+++ b/app/src/main/java/com/example/tampopo_client/views/ChatActivity.java
@@ -125,6 +125,7 @@
     //戻るボタン
     backButton.setOnClickListener(new OnClickListener() { //backButtonがクリックされたときの処理
       public void onClick(View view) { //ボタンがクリックされたときに実行される処理本体
+        chatViewModel.destroyChatroom(tampopo.getChatroomId(),tampopo.getUserId(),tampopo.getToken());
         Intent intent = new Intent(ChatActivity.this, MainActivity.class); //ChatActivity から MainActivity に画面遷移
         startActivity(intent);
       }
diff --git a/app/src/main/java/com/example/tampopo_client/views/MainActivity.java b/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
index 9d7e2aa..cc87426 100644
--- a/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
+++ b/app/src/main/java/com/example/tampopo_client/views/MainActivity.java
@@ -123,10 +123,12 @@
             @Override
             public void onChanged(String chatRoomId) {
                 tampopo.setChatroomId(chatRoomId);
+                chatViewModel.setChatRoomId(chatRoomId);
             }
         });
 
 
+
         MutableLiveData<List<String>> friendsLiveData = activityViewModel.getFriendUserIdsLiveData();
 
         friendsLiveData.observe(this, new Observer<List<String>>() {