diff --git a/src/main/java/com/example/cosmos_serversb/entities/Group.java b/src/main/java/com/example/cosmos_serversb/entities/Group.java
index 4c98291..7b2805b 100644
--- a/src/main/java/com/example/cosmos_serversb/entities/Group.java
+++ b/src/main/java/com/example/cosmos_serversb/entities/Group.java
@@ -1,7 +1,9 @@
 //このクラスは仮です
 package com.example.cosmos_serversb.entities;
 
+import com.example.cosmos_serversb.models.SessionManager;
 import com.example.cosmos_serversb.models.Users;
+import org.hibernate.Session;
 
 import java.util.ArrayList;
 import java.util.HashSet;
@@ -87,8 +89,14 @@
     public void addMember(String uId){
         // User user = new User(uId, uId, "http:test", "hogehoge");
         User user = Users.getInstance().getUserById(uId);
-        members.add(user);
-//        user.addGroups(this);
+        if(user != null) {
+            members.add(user);
+            user.addGroups(this);
+            Session session = SessionManager.getInstance().getSession();
+            session.update(user);
+        }else{
+            //例外処理
+        }
     }
 
 }
diff --git a/src/main/java/com/example/cosmos_serversb/models/Groups.java b/src/main/java/com/example/cosmos_serversb/models/Groups.java
index 94873fc..3a9afaa 100644
--- a/src/main/java/com/example/cosmos_serversb/models/Groups.java
+++ b/src/main/java/com/example/cosmos_serversb/models/Groups.java
@@ -53,6 +53,12 @@
         Group testGroup = new Group(gId, uri, name, uId);
         Session session = SessionManager.getInstance().getSession();
         session.save(testGroup);
+        SessionManager.getInstance().closeSession();
+
+        session = SessionManager.getSession().getSession();
+        testGroup.addMember(uId);
+        session.update(testGroup);
+        SessionManager.getInstance().closeSession();
         return testGroup;
     }
 
diff --git a/src/main/java/com/example/cosmos_serversb/models/Users.java b/src/main/java/com/example/cosmos_serversb/models/Users.java
index b73d929..5a8f745 100644
--- a/src/main/java/com/example/cosmos_serversb/models/Users.java
+++ b/src/main/java/com/example/cosmos_serversb/models/Users.java
@@ -93,8 +93,6 @@
                 User findUser = (User) session.load(User.class, uId);
                 return findUser;
 //                System.out.println( "name: " + user.getName() + "iconUri : " + user.getIconUri());
-            }else{
-                break;
             }
         }
         //一致しない場合は返す必要がないのでnull