diff --git a/apps/client/src/scenes/game/application/GameNetworkSync.ts b/apps/client/src/scenes/game/application/GameNetworkSync.ts
index 25fc668..eed8e01 100644
--- a/apps/client/src/scenes/game/application/GameNetworkSync.ts
+++ b/apps/client/src/scenes/game/application/GameNetworkSync.ts
@@ -73,8 +73,6 @@
   private handlePlayerUpdates = (changedPlayers: UpdatePlayersPayload) => {
     // UPDATE_PLAYERS は差分のみ届くため，対象IDだけ上書き更新する
     changedPlayers.forEach((playerData) => {
-      if (playerData.id === this.myId) return;
-
       const target = this.players[playerData.id];
       if (target && target instanceof RemotePlayerController) {
         target.applyRemoteUpdate({ x: playerData.x, y: playerData.y });
diff --git a/apps/server/src/application/coordinators/startGameCoordinator.ts b/apps/server/src/application/coordinators/startGameCoordinator.ts
index c69f378..e233507 100644
--- a/apps/server/src/application/coordinators/startGameCoordinator.ts
+++ b/apps/server/src/application/coordinators/startGameCoordinator.ts
@@ -22,6 +22,7 @@
   output: Pick<
     GameOutputPort,
     | "publishUpdatePlayersToRoom"
+    | "publishUpdatePlayersToSocket"
     | "publishMapCellUpdatesToRoom"
     | "publishGameEndToRoom"
     | "publishGameResultToRoom"
diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 7c46ac3..02578b3 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -51,6 +51,10 @@
     roomId: roomTypes.Room["roomId"],
     players: UpdatePlayersPayload
   ): void;
+  publishUpdatePlayersToSocket(
+    socketId: string,
+    players: UpdatePlayersPayload
+  ): void;
   publishMapCellUpdatesToRoom(
     roomId: roomTypes.Room["roomId"],
     cellUpdates: UpdateMapCellsPayload
diff --git a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
index bb7e8b4..7ec726b 100644
--- a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
@@ -14,6 +14,7 @@
   output: Pick<
     GameOutputPort,
     | "publishUpdatePlayersToRoom"
+    | "publishUpdatePlayersToSocket"
     | "publishMapCellUpdatesToRoom"
     | "publishGameEndToRoom"
     | "publishGameResultToRoom"
@@ -34,7 +35,17 @@
     playerIds,
     (tickData) => {
       if (tickData.playerUpdates.length > 0) {
-        output.publishUpdatePlayersToRoom(roomId, tickData.playerUpdates);
+        playerIds.forEach((playerId) => {
+          const updatesForPlayer = tickData.playerUpdates.filter(
+            (playerUpdate) => playerUpdate.id !== playerId
+          );
+
+          if (updatesForPlayer.length === 0) {
+            return;
+          }
+
+          output.publishUpdatePlayersToSocket(playerId, updatesForPlayer);
+        });
       }
 
       if (tickData.cellUpdates.length > 0) {
diff --git a/apps/server/src/network/adapters/socketEmitters.ts b/apps/server/src/network/adapters/socketEmitters.ts
index 4d75643..9ced072 100644
--- a/apps/server/src/network/adapters/socketEmitters.ts
+++ b/apps/server/src/network/adapters/socketEmitters.ts
@@ -20,6 +20,11 @@
   <TEvent extends SocketEventName>(event: TEvent, payload: ServerToClientPayloadOf<TEvent>): void;
 };
 
+type EmitToSocketById = {
+  <TEvent extends SocketEventName>(socketId: string, event: TEvent): void;
+  <TEvent extends SocketEventName>(socketId: string, event: TEvent, payload: ServerToClientPayloadOf<TEvent>): void;
+};
+
 type EmitToAll = {
   <TEvent extends SocketEventName>(event: TEvent): void;
   <TEvent extends SocketEventName>(event: TEvent, payload: ServerToClientPayloadOf<TEvent>): void;
@@ -53,6 +58,13 @@
   };
 };
 
+/** 任意ソケットID向けの送信関数を生成する */
+export const createEmitToSocketById = (io: Server): EmitToSocketById => {
+  return (socketId: string, event: SocketEventName, payload?: unknown) => {
+    emitWithOptionalPayload((eventName, body) => io.to(socketId).emit(eventName, body), event, payload);
+  };
+};
+
 /** 全接続向けの送信関数を生成する */
 export const createEmitToAll = (io: Server): EmitToAll => {
   return (event: SocketEventName, payload?: unknown) => {
diff --git a/apps/server/src/network/handlers/CommonHandler.ts b/apps/server/src/network/handlers/CommonHandler.ts
index cd6bb1e..5e728b4 100644
--- a/apps/server/src/network/handlers/CommonHandler.ts
+++ b/apps/server/src/network/handlers/CommonHandler.ts
@@ -7,6 +7,7 @@
   createEmitToAll,
   createEmitToRoom,
   createEmitToSocket,
+  createEmitToSocketById,
 } from "@server/network/adapters/socketEmitters";
 
 /** ハンドラで共通利用する送信コンテキスト */
@@ -14,6 +15,7 @@
   emitToAll: ReturnType<typeof createEmitToAll>;
   emitToRoom: ReturnType<typeof createEmitToRoom>;
   emitToSocket: ReturnType<typeof createEmitToSocket>;
+  emitToSocketById: ReturnType<typeof createEmitToSocketById>;
 };
 
 /** 送信先別のエミッタをまとめた共通コンテキストを生成する */
@@ -25,5 +27,6 @@
     emitToAll: createEmitToAll(io),
     emitToRoom: createEmitToRoom(io),
     emitToSocket: createEmitToSocket(socket),
+    emitToSocketById: createEmitToSocketById(io),
   };
 };
diff --git a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
index 1e3e779..728f8c1 100644
--- a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
+++ b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
@@ -39,6 +39,9 @@
     publishUpdatePlayersToRoom: (roomId: RoomId, players: UpdatePlayersPayload) => {
       common.emitToRoom(roomId, protocol.SocketEvents.UPDATE_PLAYERS, players);
     },
+    publishUpdatePlayersToSocket: (socketId: string, players: UpdatePlayersPayload) => {
+      common.emitToSocketById(socketId, protocol.SocketEvents.UPDATE_PLAYERS, players);
+    },
     publishMapCellUpdatesToRoom: (roomId: RoomId, cellUpdates: UpdateMapCellsPayload) => {
       common.emitToRoom(roomId, protocol.SocketEvents.UPDATE_MAP_CELLS, cellUpdates);
     },