diff --git a/src/main/java/cactusServer/entities/AddressedEntity.java b/src/main/java/cactusServer/entities/AddressedEntity.java
new file mode 100644
index 0000000..2b3dc80
--- /dev/null
+++ b/src/main/java/cactusServer/entities/AddressedEntity.java
@@ -0,0 +1,23 @@
+package cactusServer.entities;
+
+/**
+ * �e���\�[�X��POST�ō쐬�����ۂ�, ���Y���\�[�X�̎��̂�URI���Ăяo�����ɕԂ��Ƃ��ɗp����N���X
+ * @author r-isitani
+ *
+ */
+public class AddressedEntity {
+	private String URI;
+	private Entity body;
+	
+	public AddressedEntity(String URI, Entity body) {
+		this.URI = URI;
+		this.body = body;
+	}
+	
+	public String getURI() {
+		return URI;
+	}
+	public Entity getBody() {
+		return body;
+	}
+}
diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
index 5050012..222db78 100644
--- a/src/main/java/cactusServer/entities/Area.java
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -2,7 +2,7 @@
 
 import java.util.HashSet;
 
-public class Area {
+public class Area extends Entity{
 	private String name;
 	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
 	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
diff --git a/src/main/java/cactusServer/entities/Character.java b/src/main/java/cactusServer/entities/Character.java
index 76b37de..bf8b4dd 100644
--- a/src/main/java/cactusServer/entities/Character.java
+++ b/src/main/java/cactusServer/entities/Character.java
@@ -10,7 +10,7 @@
 import framework.model3D.Position3D;
 import net.arnx.jsonic.JSONHint;
 
-public class Character {
+public class Character extends Entity{
 	private URI accountURI;
 	private String name;
 	private Position3D position;
diff --git a/src/main/java/cactusServer/entities/Entity.java b/src/main/java/cactusServer/entities/Entity.java
new file mode 100644
index 0000000..433e43c
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Entity.java
@@ -0,0 +1,10 @@
+package cactusServer.entities;
+
+/**
+ * AddressedEntity�N���X�ɂĈ������̂�\�����ۃN���X
+ * @author r-isitani
+ *
+ */
+public abstract class Entity {
+
+}
diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index f3f9986..9bd0225 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -7,6 +7,7 @@
 import java.util.Map;
 import java.util.Set;
 
+import cactusServer.entities.Entity;
 import cactusServer.entities.Object;
 import cactusServer.utils.RandomStringGenerator;
 import cactusServer.entities.Character;
@@ -18,7 +19,7 @@
  * @author ryo isitani
  *
  */
-public class Instance {
+public class Instance extends Entity {
 	private String name;
 	private State state;
 //	private StageModel stage;
diff --git a/src/main/java/cactusServer/entities/Item.java b/src/main/java/cactusServer/entities/Item.java
index 9bc9af3..77ff15f 100644
--- a/src/main/java/cactusServer/entities/Item.java
+++ b/src/main/java/cactusServer/entities/Item.java
@@ -1,6 +1,6 @@
 package cactusServer.entities;
 
-public class Item {
+public class Item extends Entity{
 	private String name;
 	private int amount;
 	
diff --git a/src/main/java/cactusServer/entities/Object.java b/src/main/java/cactusServer/entities/Object.java
index 8d9f067..9c2b7b6 100644
--- a/src/main/java/cactusServer/entities/Object.java
+++ b/src/main/java/cactusServer/entities/Object.java
@@ -6,7 +6,7 @@
 import framework.physics.AngularVelocity3D;
 import framework.physics.Velocity3D;
 
-public class Object {
+public class Object extends Entity{
 	private Position3D position;
 	private Velocity3D velocity;
 	private AngularVelocity3D angularVelocity;