diff --git a/src/main/java/com/example/cosmos_serversb/CosmosServerSbApplication.java b/src/main/java/com/example/cosmos_serversb/CosmosServerSbApplication.java
index aaa3e30..3a68a6c 100644
--- a/src/main/java/com/example/cosmos_serversb/CosmosServerSbApplication.java
+++ b/src/main/java/com/example/cosmos_serversb/CosmosServerSbApplication.java
@@ -4,7 +4,9 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
-public class CosmosServerSbApplication {
+public class
+
+CosmosServerSbApplication {
 
     public static void main(String[] args) {
         SpringApplication.run(CosmosServerSbApplication.class, args);
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 a29e9a1..f600d03 100644
--- a/src/main/java/com/example/cosmos_serversb/entities/Group.java
+++ b/src/main/java/com/example/cosmos_serversb/entities/Group.java
@@ -7,7 +7,7 @@
 public class Group {
     private String gId;
     private String uri, name;
-    private ArrayList<User> members;
+    private Set<User> members;
     //private ArrayList<Request> requests;
     private Set<Request> requests;
 
@@ -64,14 +64,21 @@
     public void addRequests(Request request){
         requests.add(request);
     }
-/*
+
+    /*
     public ArrayList<Request> getRequestsList(){
         ArrayList<Request> list = new ArrayList<Request>(getRequests());
         return list;
     }
+   */
 
- */
+    public void setMembers(Set<User> members) {
+        this.members = members;
+    }
 
+    public Set<User> getMembers() {
+        return members;
+    }
 
     /*メンバー*/
     //public ArrayList<User> getMembersList(){
diff --git a/src/main/resources/Group.hbm.xml b/src/main/resources/Group.hbm.xml
index d5733ed..e909116 100644
--- a/src/main/resources/Group.hbm.xml
+++ b/src/main/resources/Group.hbm.xml
@@ -21,6 +21,20 @@
             <key column = "GID" not-null="false"/>
             <one-to-many class="Request"/>
         </set>
+
+        <set name = "members"
+             table = "USER_GROUP"
+             lazy = "true"
+             inverse = "true"
+             cascade = "all">
+            <key column = "GID"/>
+            <many-to-many
+                class = "com.example.cosmos_serversb.entities.User"
+                column = "UID"
+                outer-join="auto"
+            />
+
+        </set>
     </class>
 
 </hibernate-mapping>