diff --git a/map4.html b/map4.html
index ed5c81d..4a4a31a 100644
--- a/map4.html
+++ b/map4.html
@@ -53,3 +53,11 @@
   <script src="map4.js"></script>
 </body>
 </html>
+
+<div id="chat">
+  <div id="chatList" class="chat-list"></div>
+  <div class="chat-input-area">
+    <input id="chatInput" type="text" placeholder="メッセージを入力">
+    <button id="chatSend">送信</button>
+  </div>
+</div>