diff --git a/apps/client/src/hooks/useAppFlow.ts b/apps/client/src/hooks/useAppFlow.ts
index ed9d840..bb6bafc 100644
--- a/apps/client/src/hooks/useAppFlow.ts
+++ b/apps/client/src/hooks/useAppFlow.ts
@@ -19,6 +19,16 @@
   const [joinErrorMessage, setJoinErrorMessage] = useState<string | null>(null);
   const [isJoining, setIsJoining] = useState(false);
   const joinTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const joinRejectedHandlerRef = useRef<((payload: roomTypes.JoinRoomRejectedPayload) => void) | null>(null);
+
+  const clearJoinRejectedHandler = () => {
+    if (!joinRejectedHandlerRef.current) {
+      return;
+    }
+
+    socketManager.title.offJoinRejected(joinRejectedHandlerRef.current);
+    joinRejectedHandlerRef.current = null;
+  };
 
   const clearJoinTimeout = () => {
     if (!joinTimeoutRef.current) {
@@ -35,30 +45,15 @@
     }
 
     clearJoinTimeout();
+    clearJoinRejectedHandler();
     setJoinErrorMessage(null);
     setIsJoining(true);
-    joinTimeoutRef.current = setTimeout(() => {
-      setIsJoining(false);
-      setJoinErrorMessage("参加要求がタイムアウトしました，もう一度お試しください");
-      joinTimeoutRef.current = null;
-    }, config.GAME_CONFIG.JOIN_REQUEST_TIMEOUT_MS);
-    socketManager.title.joinRoom(payload);
-  };
 
-  useEffect(() => {
-    const handleConnect = (id: string) => {
-      setMyId(id);
-    };
-    const handleRoomUpdate = (updatedRoom: roomTypes.Room) => {
-      clearJoinTimeout();
-      setRoom(updatedRoom);
-      setIsJoining(false);
-      setJoinErrorMessage(null);
-      setScenePhase(appConsts.ScenePhase.LOBBY);
-    };
     const handleJoinRejected = (payload: roomTypes.JoinRoomRejectedPayload) => {
       clearJoinTimeout();
       setIsJoining(false);
+      joinRejectedHandlerRef.current = null;
+
       if (payload.reason === "full") {
         setJoinErrorMessage(`ルーム ${payload.roomId} は満員です`);
         return;
@@ -68,21 +63,45 @@
         setJoinErrorMessage(`ルーム ${payload.roomId} への参加要求が重複しました`);
       }
     };
+
+    joinRejectedHandlerRef.current = handleJoinRejected;
+    socketManager.title.onceJoinRejected(handleJoinRejected);
+
+    joinTimeoutRef.current = setTimeout(() => {
+      clearJoinRejectedHandler();
+      setIsJoining(false);
+      setJoinErrorMessage("参加要求がタイムアウトしました，もう一度お試しください");
+      joinTimeoutRef.current = null;
+    }, config.GAME_CONFIG.JOIN_REQUEST_TIMEOUT_MS);
+
+    socketManager.title.joinRoom(payload);
+  };
+
+  useEffect(() => {
+    const handleConnect = (id: string) => {
+      setMyId(id);
+    };
+    const handleRoomUpdate = (updatedRoom: roomTypes.Room) => {
+      clearJoinTimeout();
+      clearJoinRejectedHandler();
+      setRoom(updatedRoom);
+      setIsJoining(false);
+      setJoinErrorMessage(null);
+      setScenePhase(appConsts.ScenePhase.LOBBY);
+    };
     const handleGameStart = () => {
       setScenePhase(appConsts.ScenePhase.PLAYING);
     };
 
     socketManager.common.onConnect(handleConnect);
-    socketManager.title.onJoinRejected(handleJoinRejected);
     socketManager.lobby.onRoomUpdate(handleRoomUpdate);
-    socketManager.game.onGameStart(handleGameStart);
+    socketManager.game.onceGameStart(handleGameStart);
 
     return () => {
       clearJoinTimeout();
+      clearJoinRejectedHandler();
       socketManager.common.offConnect(handleConnect);
-      socketManager.title.offJoinRejected(handleJoinRejected);
       socketManager.lobby.offRoomUpdate(handleRoomUpdate);
-      socketManager.game.offGameStart(handleGameStart);
     };
   }, []);
 
diff --git a/apps/client/src/network/handlers/GameHandler.ts b/apps/client/src/network/handlers/GameHandler.ts
index 926875c..e4b307d 100644
--- a/apps/client/src/network/handlers/GameHandler.ts
+++ b/apps/client/src/network/handlers/GameHandler.ts
@@ -29,6 +29,7 @@
   onUpdateMapCells: (callback: (updates: UpdateMapCellsPayload) => void) => void;
   offUpdateMapCells: (callback: (updates: UpdateMapCellsPayload) => void) => void;
   onGameStart: (callback: (data: GameStartPayload) => void) => void;
+  onceGameStart: (callback: (data: GameStartPayload) => void) => void;
   offGameStart: (callback: (data: GameStartPayload) => void) => void;
   sendMove: (x: number, y: number) => void;
   readyForGame: () => void;
@@ -36,7 +37,7 @@
 
 /** ソケットインスタンスからゲーム向けハンドラを生成する */
 export const createGameHandler = (socket: Socket): GameHandler => {
-  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
+  const { onEvent, onceEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     onCurrentPlayers: (callback) => {
@@ -72,6 +73,9 @@
     onGameStart: (callback) => {
       onEvent(protocol.SocketEvents.GAME_START, callback);
     },
+    onceGameStart: (callback) => {
+      onceEvent(protocol.SocketEvents.GAME_START, callback);
+    },
     offGameStart: (callback) => {
       offEvent(protocol.SocketEvents.GAME_START, callback);
     },
diff --git a/apps/client/src/network/handlers/LobbyHandler.ts b/apps/client/src/network/handlers/LobbyHandler.ts
index 338b2e8..9b1c594 100644
--- a/apps/client/src/network/handlers/LobbyHandler.ts
+++ b/apps/client/src/network/handlers/LobbyHandler.ts
@@ -5,17 +5,21 @@
 
 type LobbyHandler = {
   onRoomUpdate: (callback: (room: PayloadOf<typeof protocol.SocketEvents.ROOM_UPDATE>) => void) => void;
+  onceRoomUpdate: (callback: (room: PayloadOf<typeof protocol.SocketEvents.ROOM_UPDATE>) => void) => void;
   offRoomUpdate: (callback: (room: PayloadOf<typeof protocol.SocketEvents.ROOM_UPDATE>) => void) => void;
   startGame: () => void;
 };
 
 export const createLobbyHandler = (socket: Socket): LobbyHandler => {
-  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
+  const { onEvent, onceEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     onRoomUpdate: (callback) => {
       onEvent(protocol.SocketEvents.ROOM_UPDATE, callback);
     },
+    onceRoomUpdate: (callback) => {
+      onceEvent(protocol.SocketEvents.ROOM_UPDATE, callback);
+    },
     offRoomUpdate: (callback) => {
       offEvent(protocol.SocketEvents.ROOM_UPDATE, callback);
     },
diff --git a/apps/client/src/network/handlers/TitleHandler.ts b/apps/client/src/network/handlers/TitleHandler.ts
index bdf970e..04d3a91 100644
--- a/apps/client/src/network/handlers/TitleHandler.ts
+++ b/apps/client/src/network/handlers/TitleHandler.ts
@@ -6,11 +6,12 @@
 type TitleHandler = {
   joinRoom: (payload: PayloadOf<typeof protocol.SocketEvents.JOIN_ROOM>) => void;
   onJoinRejected: (callback: (payload: PayloadOf<typeof protocol.SocketEvents.ROOM_JOIN_REJECTED>) => void) => void;
+  onceJoinRejected: (callback: (payload: PayloadOf<typeof protocol.SocketEvents.ROOM_JOIN_REJECTED>) => void) => void;
   offJoinRejected: (callback: (payload: PayloadOf<typeof protocol.SocketEvents.ROOM_JOIN_REJECTED>) => void) => void;
 };
 
 export const createTitleHandler = (socket: Socket): TitleHandler => {
-  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
+  const { onEvent, onceEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     joinRoom: (payload) => {
@@ -19,6 +20,9 @@
     onJoinRejected: (callback) => {
       onEvent(protocol.SocketEvents.ROOM_JOIN_REJECTED, callback);
     },
+    onceJoinRejected: (callback) => {
+      onceEvent(protocol.SocketEvents.ROOM_JOIN_REJECTED, callback);
+    },
     offJoinRejected: (callback) => {
       offEvent(protocol.SocketEvents.ROOM_JOIN_REJECTED, callback);
     }
diff --git a/apps/client/src/network/handlers/socketEventBridge.ts b/apps/client/src/network/handlers/socketEventBridge.ts
index 56615ad..aead5bc 100644
--- a/apps/client/src/network/handlers/socketEventBridge.ts
+++ b/apps/client/src/network/handlers/socketEventBridge.ts
@@ -11,6 +11,13 @@
     (socket as any).on(event, callback);
   };
 
+  const onceEvent = <TEvent extends SocketEventName>(
+    event: TEvent,
+    callback: (payload: PayloadOf<TEvent>) => void
+  ) => {
+    (socket as any).once(event, callback);
+  };
+
   const offEvent = <TEvent extends SocketEventName>(
     event: TEvent,
     callback: (payload: PayloadOf<TEvent>) => void
@@ -31,6 +38,7 @@
 
   return {
     onEvent,
+    onceEvent,
     offEvent,
     emitEvent,
   };
diff --git a/apps/server/src/network/handlers/socketEventBridge.ts b/apps/server/src/network/handlers/socketEventBridge.ts
index 54d0369..1db3c62 100644
--- a/apps/server/src/network/handlers/socketEventBridge.ts
+++ b/apps/server/src/network/handlers/socketEventBridge.ts
@@ -11,7 +11,15 @@
     (socket as any).on(event, callback);
   };
 
+  const onceEvent = <TEvent extends SocketEventName>(
+    event: TEvent,
+    callback: (payload: PayloadOf<TEvent>) => void
+  ) => {
+    (socket as any).once(event, callback);
+  };
+
   return {
     onEvent,
+    onceEvent,
   };
 };