diff --git a/apps/client/src/network/handlers/CommonHandler.ts b/apps/client/src/network/handlers/CommonHandler.ts
index 61b35d2..76b798a 100644
--- a/apps/client/src/network/handlers/CommonHandler.ts
+++ b/apps/client/src/network/handlers/CommonHandler.ts
@@ -1,8 +1,7 @@
 import type { Socket } from "socket.io-client";
 import { protocol } from "@repo/shared";
-import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
-
-type SocketEventName = keyof SocketPayloadMap;
+import type { PayloadOf } from "@repo/shared";
+import { createClientSocketEventBridge } from "./socketEventBridge";
 
 type CommonHandler = {
   onConnect: (callback: (id: string) => void) => void;
@@ -15,19 +14,7 @@
     (payload: PayloadOf<typeof protocol.SocketEvents.CONNECT>) => void
   >();
 
-  const onEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
-
-  const offEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).off(event, callback);
-  };
+  const { onEvent, offEvent } = createClientSocketEventBridge(socket);
 
   return {
     onConnect: (callback: (id: string) => void) => {
diff --git a/apps/client/src/network/handlers/GameHandler.ts b/apps/client/src/network/handlers/GameHandler.ts
index 597f7e3..926875c 100644
--- a/apps/client/src/network/handlers/GameHandler.ts
+++ b/apps/client/src/network/handlers/GameHandler.ts
@@ -10,14 +10,11 @@
   GameStartPayload,
   MovePayload,
   NewPlayerPayload,
-  PayloadOf,
   RemovePlayerPayload,
-  SocketPayloadMap,
   UpdateMapCellsPayload,
   UpdatePlayersPayload,
 } from "@repo/shared";
-
-type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
+import { createClientSocketEventBridge } from "./socketEventBridge";
 
 /** ゲームシーンが利用するソケット操作の契約 */
 export type GameHandler = {
@@ -39,30 +36,7 @@
 
 /** 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 = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
-
-  const offEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).off(event, callback);
-  };
-
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload: PayloadOf<TEvent>): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload?: PayloadOf<TEvent>): void {
-    if (payload === undefined) {
-      (socket as any).emit(event);
-      return;
-    }
-
-    (socket as any).emit(event, payload);
-  }
+  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     onCurrentPlayers: (callback) => {
diff --git a/apps/client/src/network/handlers/LobbyHandler.ts b/apps/client/src/network/handlers/LobbyHandler.ts
index 0a7cad1..338b2e8 100644
--- a/apps/client/src/network/handlers/LobbyHandler.ts
+++ b/apps/client/src/network/handlers/LobbyHandler.ts
@@ -1,8 +1,7 @@
 import type { Socket } from "socket.io-client";
 import { protocol } from "@repo/shared";
-import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
-
-type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
+import type { PayloadOf } from "@repo/shared";
+import { createClientSocketEventBridge } from "./socketEventBridge";
 
 type LobbyHandler = {
   onRoomUpdate: (callback: (room: PayloadOf<typeof protocol.SocketEvents.ROOM_UPDATE>) => void) => void;
@@ -11,30 +10,7 @@
 };
 
 export const createLobbyHandler = (socket: Socket): LobbyHandler => {
-  const onEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
-
-  const offEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).off(event, callback);
-  };
-
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload: PayloadOf<TEvent>): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload?: PayloadOf<TEvent>): void {
-    if (payload === undefined) {
-      (socket as any).emit(event);
-      return;
-    }
-
-    (socket as any).emit(event, payload);
-  }
+  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     onRoomUpdate: (callback) => {
diff --git a/apps/client/src/network/handlers/TitleHandler.ts b/apps/client/src/network/handlers/TitleHandler.ts
index d91da27..bdf970e 100644
--- a/apps/client/src/network/handlers/TitleHandler.ts
+++ b/apps/client/src/network/handlers/TitleHandler.ts
@@ -1,8 +1,7 @@
 import type { Socket } from "socket.io-client";
 import { protocol } from "@repo/shared";
-import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
-
-type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
+import type { PayloadOf } from "@repo/shared";
+import { createClientSocketEventBridge } from "./socketEventBridge";
 
 type TitleHandler = {
   joinRoom: (payload: PayloadOf<typeof protocol.SocketEvents.JOIN_ROOM>) => void;
@@ -11,30 +10,7 @@
 };
 
 export const createTitleHandler = (socket: Socket): TitleHandler => {
-  const onEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
-
-  const offEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).off(event, callback);
-  };
-
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload: PayloadOf<TEvent>): void;
-  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload?: PayloadOf<TEvent>): void {
-    if (payload === undefined) {
-      (socket as any).emit(event);
-      return;
-    }
-
-    (socket as any).emit(event, payload);
-  }
+  const { onEvent, offEvent, emitEvent } = createClientSocketEventBridge(socket);
 
   return {
     joinRoom: (payload) => {
diff --git a/apps/client/src/network/handlers/socketEventBridge.ts b/apps/client/src/network/handlers/socketEventBridge.ts
new file mode 100644
index 0000000..56615ad
--- /dev/null
+++ b/apps/client/src/network/handlers/socketEventBridge.ts
@@ -0,0 +1,37 @@
+import type { Socket } from "socket.io-client";
+import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
+
+type SocketEventName = keyof SocketPayloadMap;
+
+export const createClientSocketEventBridge = (socket: Socket) => {
+  const onEvent = <TEvent extends SocketEventName>(
+    event: TEvent,
+    callback: (payload: PayloadOf<TEvent>) => void
+  ) => {
+    (socket as any).on(event, callback);
+  };
+
+  const offEvent = <TEvent extends SocketEventName>(
+    event: TEvent,
+    callback: (payload: PayloadOf<TEvent>) => void
+  ) => {
+    (socket as any).off(event, callback);
+  };
+
+  function emitEvent<TEvent extends SocketEventName>(event: TEvent): void;
+  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload: PayloadOf<TEvent>): void;
+  function emitEvent<TEvent extends SocketEventName>(event: TEvent, payload?: PayloadOf<TEvent>): void {
+    if (payload === undefined) {
+      (socket as any).emit(event);
+      return;
+    }
+
+    (socket as any).emit(event, payload);
+  }
+
+  return {
+    onEvent,
+    offEvent,
+    emitEvent,
+  };
+};
diff --git a/apps/server/src/network/handlers/game/registerGameHandlers.ts b/apps/server/src/network/handlers/game/registerGameHandlers.ts
index 302daf7..5b1b631 100644
--- a/apps/server/src/network/handlers/game/registerGameHandlers.ts
+++ b/apps/server/src/network/handlers/game/registerGameHandlers.ts
@@ -4,7 +4,6 @@
  */
 import { Server, Socket } from "socket.io";
 import { protocol } from "@repo/shared";
-import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
 import { readyForGameCoordinator } from "@server/application/coordinators/readyForGameCoordinator";
 import { startGameCoordinator } from "@server/application/coordinators/startGameCoordinator";
 import type {
@@ -19,10 +18,9 @@
 import { logEvent } from "@server/logging/logEvent";
 import { createCommonHandlerContext } from "@server/network/handlers/CommonHandler";
 import { isMovePayload, isPingPayload } from "@server/network/validation/socketPayloadValidators";
+import { createServerSocketOnBridge } from "@server/network/handlers/socketEventBridge";
 import { createGameOutputAdapter } from "./createGameOutputAdapter";
 
-type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
-
 /** ゲームイベントの購読とユースケース呼び出しを設定する */
 export const registerGameHandlers = (
   io: Server,
@@ -32,13 +30,7 @@
 ) => {
   const common = createCommonHandlerContext(io, socket);
   const gameOutputAdapter = createGameOutputAdapter(common);
-
-  const onEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
+  const { onEvent } = createServerSocketOnBridge(socket);
 
   // 遅延計測用のPINGを検証しPONGを返す
   onEvent(protocol.SocketEvents.PING, (clientTime) => {
diff --git a/apps/server/src/network/handlers/room/registerRoomHandlers.ts b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
index 459305c..e799931 100644
--- a/apps/server/src/network/handlers/room/registerRoomHandlers.ts
+++ b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
@@ -4,16 +4,14 @@
  */
 import { Server, Socket } from "socket.io";
 import { protocol } from "@repo/shared";
-import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
 import type { JoinRoomPort } from "@server/domains/room/application/ports/roomUseCasePorts";
 import { joinRoomUseCase } from "@server/domains/room/application/useCases/joinRoomUseCase";
 import { logEvent } from "@server/logging/logEvent";
 import { createCommonHandlerContext } from "@server/network/handlers/CommonHandler";
+import { createServerSocketOnBridge } from "@server/network/handlers/socketEventBridge";
 import { isJoinRoomPayload } from "@server/network/validation/socketPayloadValidators";
 import { createRoomOutputAdapter } from "./createRoomOutputAdapter";
 
-type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
-
 /** ルーム参加イベントを検証して参加ユースケースへ連携する */
 export const registerRoomHandlers = (
   io: Server,
@@ -22,13 +20,7 @@
 ) => {
   const common = createCommonHandlerContext(io, socket);
   const roomOutputAdapter = createRoomOutputAdapter(common);
-
-  const onEvent = <TEvent extends SocketEventName>(
-    event: TEvent,
-    callback: (payload: PayloadOf<TEvent>) => void
-  ) => {
-    (socket as any).on(event, callback);
-  };
+  const { onEvent } = createServerSocketOnBridge(socket);
 
   // 参加要求のペイロード検証と参加処理を実行する
   onEvent(protocol.SocketEvents.JOIN_ROOM, async (data) => {
diff --git a/apps/server/src/network/handlers/socketEventBridge.ts b/apps/server/src/network/handlers/socketEventBridge.ts
new file mode 100644
index 0000000..54d0369
--- /dev/null
+++ b/apps/server/src/network/handlers/socketEventBridge.ts
@@ -0,0 +1,17 @@
+import type { Socket } from "socket.io";
+import type { PayloadOf, SocketPayloadMap } from "@repo/shared";
+
+type SocketEventName = Exclude<keyof SocketPayloadMap, "connect" | "disconnect">;
+
+export const createServerSocketOnBridge = (socket: Socket) => {
+  const onEvent = <TEvent extends SocketEventName>(
+    event: TEvent,
+    callback: (payload: PayloadOf<TEvent>) => void
+  ) => {
+    (socket as any).on(event, callback);
+  };
+
+  return {
+    onEvent,
+  };
+};