diff --git a/src/main/java/cactusServer/entities/Area.java b/src/main/java/cactusServer/entities/Area.java
new file mode 100644
index 0000000..5050012
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Area.java
@@ -0,0 +1,43 @@
+package cactusServer.entities;
+
+import java.util.HashSet;
+
+public class Area {
+	private String name;
+	private Plain[] region; // �C�ӌ‚̕��ʂ̕�����
+	private HashSet<Allowed> permissions; // �G���A���ʼn”\�Ȃ��Ƃ̗���
+	
+	public Area(String name, Plain[] regions, HashSet<Allowed> permissions) {
+		this.name = name;
+		this.region = regions;
+		this.permissions = permissions;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	public Plain[] getRegions() {
+		return region;
+	}
+	
+	public Plain getRegion(int index) {
+		return region[index];
+	}
+	
+	public boolean isPermission(Allowed allowed) {
+		return permissions.contains(allowed);
+	}
+	
+	public void setPermission(Allowed allowed) {
+		permissions.add(allowed);
+	}
+	
+	public void removePermission(Allowed allowed) {
+		permissions.remove(allowed);
+	}
+	
+	public static enum Allowed {
+		SHOOT, KILL;
+	}
+}
diff --git a/src/main/java/cactusServer/entities/Instance.java b/src/main/java/cactusServer/entities/Instance.java
index 6231d89..1301487 100644
--- a/src/main/java/cactusServer/entities/Instance.java
+++ b/src/main/java/cactusServer/entities/Instance.java
@@ -1,5 +1,14 @@
 package cactusServer.entities;
 
+import java.util.HashMap;
+import java.util.HashSet;
+
+import cactusServer.entities.Area.Allowed;
+import cactusServer.entities.Object;
+import framework.model3D.Position3D;
+import framework.physics.AngularVelocity3D;
+import framework.physics.Velocity3D;
+
 /**
  * �C���X�^���X
  * @author ryo isitani
@@ -7,16 +16,74 @@
  */
 public class Instance {
 	private String name;
+	private State state;
+	private HashMap<String, Area> areaMap = new HashMap<>();
+	private HashMap<String, Object> objMap = new HashMap<>();
 	
 	/**
 	 * (�����͌����_�ł̉��̂���)
 	 * @param name �C���X�^���X��
 	 */
-	public Instance(String name) {
+	public Instance(String name, State state) {
 		this.name = name;
+		this.state = state;
 	}
 
 	public String getName() {
 		return name;
 	}
+	
+	public State getState() {
+		return state;
+	}
+	
+	public HashMap<String, Area> getAreaMap() {
+		return areaMap;
+	}
+	
+	public Area getArea(String areaId) {
+		return areaMap.get(areaId);
+	}
+	
+	public HashMap<String, Object> getObjMap() {
+		return objMap;
+	}
+	
+	public Object getObject(String objId) {
+		return objMap.get(objId);
+	}
+	
+	public void setState(State state) {
+		this.state = state;
+	}
+	
+	public Area createArea(String areaId, String name, Plain[] regions, HashSet<Allowed> permissions) {
+		if (areaMap.containsKey(areaId)) {
+			return null;
+		}
+		Area area = new Area(name, regions, permissions);
+		areaMap.put(areaId, area);
+		return area;
+	}
+	
+	public Object createObject(String objId, Position3D position, Velocity3D velocity, AngularVelocity3D angularVelocity) {
+		if (objMap.containsKey(objId)) {
+			return null;
+		}
+		Object object = new Object(position, velocity, angularVelocity);
+		objMap.put(objId, object);
+		return object;
+	}
+	
+	public Area removeArea(String areaId) {
+		return areaMap.remove(areaId);
+	}
+	
+	public Object removeObject(String objId) {
+		return objMap.remove(objId);
+	}
+	
+	public static enum State {
+		AVAILABLE, MAINTENANCE;
+	}
 }
diff --git a/src/main/java/cactusServer/entities/Object.java b/src/main/java/cactusServer/entities/Object.java
new file mode 100644
index 0000000..19054f0
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Object.java
@@ -0,0 +1,43 @@
+package cactusServer.entities;
+
+import java.util.HashMap;
+
+import framework.model3D.Position3D;
+import framework.physics.AngularVelocity3D;
+import framework.physics.Velocity3D;
+
+public class Object {
+	private Position3D position;
+	private Velocity3D velocity;
+	private AngularVelocity3D angularVelocity;
+	
+	public Object(Position3D position, Velocity3D velocity, AngularVelocity3D angularVelocity) {
+		setPosition(position);
+		setVelocity(velocity);
+		setAngularVelocity(angularVelocity);
+	}
+	
+	public Position3D getPosition() {
+		return position;
+	}
+	
+	public Velocity3D getVelocity() {
+		return velocity;
+	}
+	
+	public AngularVelocity3D getAngularVelocity() {
+		return angularVelocity;
+	}
+	
+	public void setPosition(Position3D position) {
+		this.position = position;
+	}
+	
+	public void setVelocity(Velocity3D velocity) {
+		this.velocity = velocity;
+	}
+	
+	public void setAngularVelocity(AngularVelocity3D angularVelocity) {
+		this.angularVelocity = angularVelocity;
+	}
+}
diff --git a/src/main/java/cactusServer/entities/Plain.java b/src/main/java/cactusServer/entities/Plain.java
new file mode 100644
index 0000000..6d78bac
--- /dev/null
+++ b/src/main/java/cactusServer/entities/Plain.java
@@ -0,0 +1,33 @@
+package cactusServer.entities;
+
+import java.util.List;
+
+public class Plain {
+	private double a; // ���ʂ̕����� ax+by+cz+d ��a
+	private double b; // ���ʂ̕����� ax+by+cz+d ��b
+	private double c; // ���ʂ̕����� ax+by+cz+d ��c
+	private double d; // ���ʂ̕����� ax+by+cz+d ��d
+
+	public Plain(double a, double b, double c, double d) {
+		this.a = a;
+		this.b = b;
+		this.c = c;
+		this.d = d;
+	}
+	
+	public double getA() {
+		return a;
+	}
+	
+	public double getB() {
+		return b;
+	}
+	
+	public double getC() {
+		return c;
+	}
+	
+	public double getD() {
+		return d;
+	}
+}
diff --git a/src/main/java/cactusServer/models/Instances.java b/src/main/java/cactusServer/models/Instances.java
index 04dbad1..f7ee85c 100644
--- a/src/main/java/cactusServer/models/Instances.java
+++ b/src/main/java/cactusServer/models/Instances.java
@@ -14,7 +14,6 @@
 public class Instances {
 	private static Instances theInstance = null;
 	private HashMap<String, Instance> instanceMap = new HashMap<>(); // instance��ID�Ǝ��̂��Ǘ�
-	private HashSet<String> instanceIdSet = new HashSet<>(); // �g�p�ς�ID�̏W��
 
 	private Instances() {
 
@@ -43,10 +42,10 @@
 	 *         ������, instanceID���d�������ꍇ�͐V�KInstance���쐬������null��Ԃ�
 	 */
 	public Instance createInstance(String instanceId, String name) {
-		if (!instanceIdSet.add(instanceId)) {
+		if (instanceMap.containsKey(instanceId)) {
 			return null;
 		}
-		Instance instance = new Instance(name);
+		Instance instance = new Instance(name, Instance.State.AVAILABLE);
 		instanceMap.put(instanceId, instance);
 		return instance;
 	}