diff --git a/src/main/resources/Group.hbm.xml b/src/main/resources/Group.hbm.xml
index 47bb391..cc7105d 100644
--- a/src/main/resources/Group.hbm.xml
+++ b/src/main/resources/Group.hbm.xml
@@ -21,9 +21,17 @@
             <key column = "GID" not-null="false"/>
             <one-to-many class="Request"/>
         </set>
-        <set name = "members" cascade = "all" table = "USER_GROUP">
-            <key column = "GID"/>
-            <one-to-many class = "User"/>
+        <set name = "members"
+             table = "USER_GROUP"
+             lazy = "true"
+             inverse = "true"
+             cascade = "all">
+            <key column="GID"/>
+            <many-to-many
+                    class="User"
+                    column="UID"
+                    outer-join="auto">
+            </many-to-many>
         </set>
     </class>
 
diff --git a/src/main/resources/User.hbm.xml b/src/main/resources/User.hbm.xml
index 301c7d2..a072cf1 100644
--- a/src/main/resources/User.hbm.xml
+++ b/src/main/resources/User.hbm.xml
@@ -21,12 +21,15 @@
         <property name="login" column="LOGIN"/>
         <set name = "groups"
              table = "USER_GROUP"
-             outer-join = "auto"
              lazy = "true"
              inverse = "false"
              cascade = "all">
-            <key column = "UID"/>
-            <one-to-many class = "com.example.cosmos_serversb.entities.Group"/>
+            <key column="UID"/>
+            <many-to-many
+                    class="Group"
+                    column="GID"
+                    outer-join="auto">
+            </many-to-many>
         </set>
     </class>
 
diff --git a/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java b/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
index 258e0a3..65b60aa 100644
--- a/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
+++ b/src/test/java/hibernateTest/models/NativeApiIllustrationTest.java
@@ -184,22 +184,33 @@
 
 
 		/*中間テーブル(USER-GROUP)*/
-		/*ユーザの追加*/
-//		session = sessionFactory.openSession();
-//		session.beginTransaction();
-//		editGroup =  session.load(Group.class, "444");
-//		if(editGroup != null){
-//			editGroup.addMember("055");
-//			editGroup.addMember("066");//後で削除します。
-//			editGroup.addMember("077");
-//		}
-//		session.getTransaction().commit();
-//		session.close();
+		/*グループ444にユーザの追加*/
+		session = sessionFactory.openSession();
+		session.beginTransaction();
+		editGroup =  session.load(Group.class, "444");
+		if(editGroup != null){
+			editGroup.addMember("055");
+			editGroup.addMember("066");//後で削除します。
+			editGroup.addMember("077");
+		}
+		session.getTransaction().commit();
+		session.close();
 
-//		/*ユーザの削除*/
+		/*グループ333にユーザの追加*/
+		session = sessionFactory.openSession();
+		session.beginTransaction();
+		editGroup =  session.load(Group.class, "333");
+		if(editGroup != null){
+			editGroup.addMember("055");
+			editGroup.addMember("077");
+		}
+		session.getTransaction().commit();
+		session.close();
+
+		/*ユーザの削除*/
 //		session = sessionFactory.openSession();
 //		session.beginTransaction();
-//		User deleteUser = session.load(User.class, "066");//参照整合性制約でエラー
+//		User deleteUser = session.load(User.class, "066");
 //		if(deleteUser != null){
 //			session.delete(deleteUser);
 //		}
diff --git a/src/test/resources/Belong.xml b/src/test/resources/Belong.xml
new file mode 100644
index 0000000..2454e68
--- /dev/null
+++ b/src/test/resources/Belong.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+
+<!--
+  ~ Hibernate, Relational Persistence for Idiomatic Java
+  ~
+  ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+  ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+  -->
+<!DOCTYPE hibernate-mapping PUBLIC
+        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
+        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
+
+<hibernate-mapping package="hibernateTest.entities">
+
+    <class name="Belong" table="BELONG">
+        <composite-id>
+            <key-property name="uId" />
+            <key-property name="gId" />
+        </composite-id>
+    </class>
+
+</hibernate-mapping>
\ No newline at end of file
diff --git a/src/test/resources/Group.hbm.xml b/src/test/resources/Group.hbm.xml
index f56d58a..563e26f 100644
--- a/src/test/resources/Group.hbm.xml
+++ b/src/test/resources/Group.hbm.xml
@@ -24,10 +24,14 @@
         <set name = "members"
              table = "USER_GROUP"
              lazy = "true"
-             inverse = "false"
+             inverse = "true"
              cascade = "all">
-            <key column = "GID"/>
-            <one-to-many class = "hibernateTest.entities.User"/>
+            <key column="GID"/>
+            <many-to-many
+                    class="User"
+                    column="UID"
+                    outer-join="auto">
+            </many-to-many>
         </set>
     </class>
 
diff --git a/src/test/resources/User.hbm.xml b/src/test/resources/User.hbm.xml
index 5994104..b9c4c72 100644
--- a/src/test/resources/User.hbm.xml
+++ b/src/test/resources/User.hbm.xml
@@ -25,8 +25,12 @@
              lazy = "true"
              inverse = "false"
              cascade = "all">
-            <key column = "UID"/>
-            <one-to-many class = "hibernateTest.entities.Group"/>
+            <key column="UID"/>
+            <many-to-many
+                    class="Group"
+                    column="GID"
+                    outer-join="auto">
+            </many-to-many>
         </set>
     </class>