diff --git a/app/src/main/java/com/example/tampopo_client/resources/FriendRequestsResource.java b/app/src/main/java/com/example/tampopo_client/resources/FriendRequestsResource.java
index d119b3d..b82d1ae 100644
--- a/app/src/main/java/com/example/tampopo_client/resources/FriendRequestsResource.java
+++ b/app/src/main/java/com/example/tampopo_client/resources/FriendRequestsResource.java
@@ -19,7 +19,7 @@
     //このAPIではリクエストのボディをx-www-form-urlencoded という形式で送ります
     @FormUrlEncoded
     @POST("friend-requests")
-    Call<FriendRequest> postFriendRequest(
+    Call<String> postFriendRequest(
             @Field("sender-id") String senderId,
             @Field("receiver-id") String receiverId,
             @Field("token") String token
diff --git a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
index 9042e86..2b56e15 100644
--- a/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
+++ b/app/src/main/java/com/example/tampopo_client/viewmodels/FriendSentRequestViewModel.java
@@ -77,11 +77,11 @@
 
     // サーバーにフレンド申請を送信するメソッド
     public void sendFriendRequest(String senderId, String receiverId, String token) {
-        Call<FriendRequest> call = friendRequestsResource.postFriendRequest(senderId, receiverId, token);
+        Call<String> call = friendRequestsResource.postFriendRequest(senderId, receiverId, token);
 
-        call.enqueue(new Callback<FriendRequest>() {
+        call.enqueue(new Callback<String>() {
             @Override
-            public void onResponse(Call<FriendRequest> call, Response<FriendRequest> response) {
+            public void onResponse(Call<String> call, Response<String> response) {
                 if (response.isSuccessful()) {
                     //Retrofitでサーバーにリクエストを送った後、その結果が帰ってくる。成功
                     operationResult.setValue("Friend request sent successfully.");
@@ -97,7 +97,7 @@
             }
 
             @Override
-            public void onFailure(Call<FriendRequest> call, Throwable t) {
+            public void onFailure(Call<String> call, Throwable t) {
                 operationResult.setValue("Network error: " + t.getMessage());
                 System.out.println("Network error: " + t);
             }