diff --git a/src/main/java/com/example/cosmos_serversb/jsons/GroupJson.java b/src/main/java/com/example/cosmos_serversb/jsons/GroupJson.java
new file mode 100644
index 0000000..9557209
--- /dev/null
+++ b/src/main/java/com/example/cosmos_serversb/jsons/GroupJson.java
@@ -0,0 +1,90 @@
+//このクラスは仮です
+package com.example.cosmos_serversb.jsons;
+
+import com.example.cosmos_serversb.entities.Group;
+import com.example.cosmos_serversb.entities.Request;
+import com.example.cosmos_serversb.entities.User;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class GroupJson {
+    private String gId;
+    private String uri, name;
+    private Map<String, String> members = new HashMap<>();//HashSetでいいのかな？
+    private Map<String, String> requests = new HashMap<>();
+
+    public GroupJson(Group group){
+        setgId(group.getgId());
+        setUri(group.getUri());
+        setName(group.getName());
+        changeMembersMap(group.getMembers());
+        changeRequestsMap(group.getRequests());
+    }
+
+    public String getgId() {
+        return gId;
+    }
+
+    private void setgId(String gId) {
+        this.gId = gId;
+    }
+
+    public String getUri() {
+        return uri;
+    }
+
+    private void setUri(String uri){
+        this.uri = uri;
+    }
+
+    public String getUriByGid(String gId){
+        return uri;
+    }
+
+    private void setName(String name){
+        this.name = name;
+    }
+
+    public String getName(){
+        return name;
+    }
+
+    public String getNameByGid(String gId){
+        return name;
+    }
+
+    public Map<String, String> getMembers() {
+        return members;
+    }
+
+    public void setMembers(Map<String, String> members) {
+        this.members = members;
+    }
+
+    public Map<String, String> getRequests() {
+        return requests;
+    }
+
+    public void setRequests(Map<String, String> requests) {
+        this.requests = requests;
+    }
+
+    private void changeMembersMap(Set set){
+        for ( User user : (Set<User>) set ) {
+            members.put(user.getuId(), getUri());
+        }
+    }
+
+    private void changeRequestsMap(Set set){
+        for ( Request request : (Set<Request>) set ) {
+            requests.put(request.getrId(), getUri());
+        }
+    }
+
+
+
+
+}
+
diff --git a/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java b/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
index 864698f..cdfd10e 100644
--- a/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
+++ b/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
@@ -2,6 +2,7 @@
 
 import com.example.cosmos_serversb.entities.Group;
 import com.example.cosmos_serversb.entities.User;
+import com.example.cosmos_serversb.jsons.GroupJson;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.hibernate.Session;
@@ -37,15 +38,15 @@
         SessionManager.getInstance().getSession();
         Groups.addMember(group.getgId(), uId);
         SessionManager.getInstance().closeSession();
-        String json = mapper.writeValueAsString(group);//このJSONには、グループを作成したユーザの情報が含まれていません。
+//        String json = mapper.writeValueAsString(group);//このJSONには、グループを作成したユーザの情報が含まれていません。
 
         //以下が思うように動かない。
-//        Session session = SessionManager.getInstance().getSession();
+        Session session = SessionManager.getInstance().getSession();
 //        Group editedGroup = (Group) session.load(Group.class, group.getgId());//editedGroupの値がおかしい？
 //        String json = mapper.writeValueAsString(editedGroup);
-//        Group tmpGroup = new Group(session.load(Group.class, group.getgId()));
-//        String json = mapper.writeValueAsString( tmpGroup );
-//        SessionManager.getInstance().closeSession();
+        GroupJson groupJson = new GroupJson(session.load(Group.class, group.getgId()));
+        String json = mapper.writeValueAsString( groupJson );
+        SessionManager.getInstance().closeSession();
 
         return json;
     }