diff --git a/app/src/main/java/com/example/cosmosclient/resources/GroupsRest.java b/app/src/main/java/com/example/cosmosclient/resources/GroupsRest.java
index 6635b43..37aa411 100644
--- a/app/src/main/java/com/example/cosmosclient/resources/GroupsRest.java
+++ b/app/src/main/java/com/example/cosmosclient/resources/GroupsRest.java
@@ -1,4 +1,14 @@
 package com.example.cosmosclient.resources;
 
+import com.example.cosmosclient.entities.Group;
+
+import retrofit2.Call;
+import retrofit2.http.Field;
+import retrofit2.http.FormUrlEncoded;
+import retrofit2.http.POST;
+
 public interface GroupsRest {
+    @POST
+    @FormUrlEncoded
+    Call<Group> createGroup(@Field("name") String name,@Field("uId") String uId,@Field("token") String token);
 }
diff --git a/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java b/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
index 5c4cfa7..b8321c2 100644
--- a/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
+++ b/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
@@ -12,7 +12,7 @@
 
 public interface UsersRest {
     @POST("users/{uId}/login")
-    Call<SigninResponse> loginList(@Path("uId") String uId, @Query("pw") String pw);
+    Call<SigninResponse> login(@Path("uId") String uId, @Query("pw") String pw);
 
     @POST("users")
     @FormUrlEncoded
diff --git a/app/src/main/java/com/example/cosmosclient/views/MakeGroupActivity.java b/app/src/main/java/com/example/cosmosclient/views/MakeGroupActivity.java
index 0bdf9e7..a512d1d 100644
--- a/app/src/main/java/com/example/cosmosclient/views/MakeGroupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/MakeGroupActivity.java
@@ -8,6 +8,8 @@
 import android.widget.EditText;
 
 import com.example.cosmosclient.R;
+import com.example.cosmosclient.entities.Group;
+import com.example.cosmosclient.resources.GroupsRest;
 import com.example.cosmosclient.resources.UsersRest;
 
 import retrofit2.Retrofit;
@@ -24,14 +26,13 @@
         Button createGroupButton = findViewById(R.id.createGroupButton);
         String name,uId;
 
-
-//        //retrofitの処理
-//        final Retrofit retrofit = new Retrofit.Builder()
-//                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/cosmos/")
-//                .addConverterFactory(JacksonConverterFactory.create())
-//                .build();
-//        //interfaceから実装を取得
-//        final UsersRest signinService = retrofit.create(UsersRest.class);
+        //retrofitの処理
+        final Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/cosmos/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        //interfaceから実装を取得
+        final GroupsRest makeGroupService = retrofit.create(Group.class);
 
         createGroupButton.setOnClickListener(new View.OnClickListener(){
             @Override
diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
index 614edd1..7214bb7 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -58,7 +58,7 @@
             @Override
             public void onClick(View v) {
                 //APIに値を送信
-                Call<SigninResponse> call = signinService.loginList(UserIdText.getText().toString(), PasswordText.getText().toString());
+                Call<SigninResponse> call = signinService.login(UserIdText.getText().toString(), PasswordText.getText().toString());
 
                 //サーバからのレスポンス
                 call.enqueue(new Callback<SigninResponse>() {