diff --git a/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java b/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java
new file mode 100644
index 0000000..ad04de2
--- /dev/null
+++ b/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java
@@ -0,0 +1,47 @@
+package org.ntlab.tampoposerver.models;
+
+import java.util.Collection;
+
+public class ChatRooms {
+    private Integer chatRoomId;
+    private String user0Id;
+    private String user1Id;
+    private String newContent;
+    private String chatRoomNumber;
+
+    public ChatRooms(Integer chatRoomId, String user0Id, String user1Id) {
+        this.chatRoomId = chatRoomId;
+    }
+
+    public Integer getChatRoomId() {
+        return chatRoomId;
+    }
+
+    public void setChatRoomId(Integer chatRoomId) {
+        this.chatRoomId = chatRoomId;
+    }
+
+    public void addUser(String userId) {
+    }
+
+    public void put(Integer chatRoomId, String chatRoomNumber) {
+    }
+
+    public Integer updateMessage() {
+        return chatRoomId;
+    }
+
+    public ChatRooms updateMessage(Integer chatRoomId, String userId, String newContent) {this.chatRoomId = chatRoomId;
+    this.user0Id = userId;
+    this.newContent = newContent;
+    return this;}
+
+    public ChatRooms addMessage(String senderId, String content) {
+        return null;
+    }
+
+    public ChatRooms getMessages() {
+        return null;
+    }
+}
+
diff --git a/src/main/java/org/ntlab/tampoposerver/repositories/ChatRoomsRepository.java b/src/main/java/org/ntlab/tampoposerver/repositories/ChatRoomsRepository.java
new file mode 100644
index 0000000..867b778
--- /dev/null
+++ b/src/main/java/org/ntlab/tampoposerver/repositories/ChatRoomsRepository.java
@@ -0,0 +1,65 @@
+package org.ntlab.tampoposerver.repositories;
+
+import org.ntlab.tampoposerver.models.ChatRooms;
+import org.springframework.stereotype.Repository;
+
+import java.util.HashMap;
+import java.util.List;
+
+@Repository
+public class ChatRoomsRepository {
+    private final HashMap<Integer, ChatRooms> chatRooms = new HashMap<>();
+    private int id = 0;
+
+    // 新しいチャットルーム作成（空のメッセージリスト付き）
+    public ChatRooms addChatRoom(String user0Id, String user1Id) {
+        ChatRooms chatRoom = new ChatRooms(id, user0Id, user1Id);
+        chatRooms.put(id, chatRoom);
+        id++;
+        return chatRoom;
+    }
+
+    // ユーザーを既存チャットルームに追加（例：グループチャット用）
+    public ChatRooms addUserRoom(int chatRoomId, String userId) {
+        ChatRooms chatRoom = chatRooms.get(chatRoomId);
+        if (chatRoom == null) return null;
+
+        chatRoom.addUser(userId);
+        return chatRoom;
+    }
+
+    // メッセージを取得
+    public ChatRooms getMessagesFromUser(int chatRoomId, String userId) {
+        ChatRooms chatRoom = chatRooms.get(chatRoomId);
+        if (chatRoom == null) return null;
+
+        return chatRoom.getMessages();
+                //.stream().filter(m -> m.getSenderId().equals(userId));
+    }
+
+    // 新しいメッセージを追加
+    public ChatRooms addMessage(int chatRoomId, String senderId, String content) {
+        ChatRooms chatRoom = chatRooms.get(chatRoomId);
+        if (chatRoom == null) return null;
+
+        ChatRooms message = chatRoom.addMessage(senderId, content);
+        return message;
+    }
+
+    // 既存メッセージを更新
+    public ChatRooms updateMessage(int chatRoomId, String userId, String newContent) {
+        ChatRooms chatRoom = chatRooms.get(chatRoomId);
+        if (chatRoom == null) return null;
+
+        return chatRoom.updateMessage(chatRoomId, userId, newContent);
+    }
+
+    // チャットルーム削除
+    public ChatRooms deleteChatRoom(int chatRoomId) {
+        return chatRooms.remove(chatRoomId);
+    }
+
+    public ChatRooms getChatRoom(int chatRoomId) {
+        return chatRooms.get(chatRoomId);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/org/ntlab/tampoposerver/resources/ChatRoomsResource.java b/src/main/java/org/ntlab/tampoposerver/resources/ChatRoomsResource.java
new file mode 100644
index 0000000..81834e2
--- /dev/null
+++ b/src/main/java/org/ntlab/tampoposerver/resources/ChatRoomsResource.java
@@ -0,0 +1,137 @@
+package org.ntlab.tampoposerver.resources;
+
+
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.ntlab.tampoposerver.models.ChatRequest;
+import org.ntlab.tampoposerver.models.ChatRooms;
+import org.ntlab.tampoposerver.models.FriendRequest;
+import org.ntlab.tampoposerver.models.User;
+import org.ntlab.tampoposerver.repositories.ChatRequestRepository;
+import org.ntlab.tampoposerver.repositories.ChatRoomsRepository;
+import org.ntlab.tampoposerver.repositories.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+import static javax.ws.rs.core.Response.status;
+
+
+@Component
+public class ChatRoomsResource {
+    private final ChatRoomsRepository chatRoomsRepository;
+    private final UserRepository userRepository;
+
+    @Autowired
+    public ChatRoomsResource(UserRepository userRepository, ChatRoomsRepository chatRoomsRepository) {
+        this.userRepository = userRepository;
+        this.chatRoomsRepository = chatRoomsRepository;
+    }
+
+
+    //チャットルームの作成
+    @POST
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    @Produces(MediaType.TEXT_PLAIN)
+    public Response createChatRoom () {
+        return Response.status(Response.Status.OK).entity("Successfully created a chat room").build();
+    }
+
+
+    //メッセージを閲覧する
+    @GET
+    @Path("/{chat-room-id}/{user-id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getChatRoomMessages(@PathParam("chat-room-id") int chatRoomId, @PathParam("user-id") String userId) {
+        User user = userRepository.getUser(userId);
+        if (user == null) throw new NotFoundException("ユーザーが見つかりません");
+
+
+//        ChatRoom room = chatRoomsRepository.getMessage(chatRoomId);
+//        if (room == null) throw new NotFoundException("チャットルームが存在しません");
+
+
+        return Response.ok(chatRoomsRepository.getMessagesFromUser(chatRoomId, userId)).build();
+    }
+
+
+
+
+
+
+    //チャットルームの削除
+    @DELETE
+    @Path("/{chatroom-id}")
+    public Response deleteChatRoom(@PathParam("chatroom-id") int chatRoomId, @FormParam("user-id") String userId, @QueryParam("token") String token) {
+        ChatRooms room = chatRoomsRepository.getChatRoom(chatRoomId);
+        if (room == null) throw new NotFoundException("チャットルームが存在しません");
+
+        User user = userRepository.getUser(userId);
+        if (user == null) {
+            throw new NotFoundException("IDが存在しません");
+        }
+
+        if (token == null || !token.equals(user.getToken())) {
+            throw new WebApplicationException(
+                    Response.status(Response.Status.FORBIDDEN)
+                            .entity("認証失敗")
+                            .build()
+            );
+        }
+
+
+        chatRoomsRepository.deleteChatRoom(chatRoomId);
+        return Response.noContent().build();
+    }
+
+
+
+
+    //チャットルームにユーザーを追加する
+    @PUT
+    @Path("/{chatroom-id}")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public Response addChatRoomUser(@FormParam("chat-room-id") String chatRoomId, @FormParam("user-id") String userId, @QueryParam("token") String token) {
+        User user = userRepository.getUser(userId);
+        if (user == null) {
+            throw new NotFoundException("IDが存在しません");
+        }
+
+        //トークン認証
+        if (token == null || !token.equals(user.getToken())) {
+            throw new WebApplicationException(
+                    Response.status(Response.Status.FORBIDDEN)
+                            .entity("認証失敗")
+                            .build()
+            );
+        }
+
+
+        return Response.status(Response.Status.OK).entity("Successfully updated").build();
+    }
+
+
+    //チャットルームにメッセージを追加する
+    @PUT
+    @Path("/{chatroom-id}/{user-id}/message")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public Response updateMessage(@PathParam("chatroom-id") int roomId, @PathParam("user-id") String userId, @FormParam("message") String message) {
+        ChatRooms room = chatRoomsRepository.getChatRoom(roomId);
+        if (room == null) throw new NotFoundException("チャットルームが存在しません");
+
+
+        room.updateMessage(roomId, userId, message);
+        return Response.ok("Message updated").build();
+    }
+
+
+
+
+
+
+}