diff --git a/apps/client/src/network/handlers/GameHandler.ts b/apps/client/src/network/handlers/GameHandler.ts
index 0360d91..783f994 100644
--- a/apps/client/src/network/handlers/GameHandler.ts
+++ b/apps/client/src/network/handlers/GameHandler.ts
@@ -5,20 +5,25 @@
  */
 import type { Socket } from "socket.io-client";
 import { protocol } from "@repo/shared";
-import type { playerTypes, gridMapTypes, UpdatePlayersPayload } from "@repo/shared";
+import type {
+  playerTypes,
+  CurrentPlayersPayload,
+  UpdateMapCellsPayload,
+  UpdatePlayersPayload,
+} from "@repo/shared";
 
 /** ゲームシーンが利用するソケット操作の契約 */
 export type GameHandler = {
-  onCurrentPlayers: (callback: (players: playerTypes.PlayerData[] | Record<string, playerTypes.PlayerData>) => void) => void;
-  offCurrentPlayers: (callback: (players: playerTypes.PlayerData[] | Record<string, playerTypes.PlayerData>) => void) => void;
+  onCurrentPlayers: (callback: (players: CurrentPlayersPayload) => void) => void;
+  offCurrentPlayers: (callback: (players: CurrentPlayersPayload) => void) => void;
   onNewPlayer: (callback: (player: playerTypes.PlayerData) => void) => void;
   offNewPlayer: (callback: (player: playerTypes.PlayerData) => void) => void;
   onUpdatePlayers: (callback: (players: UpdatePlayersPayload) => void) => void;
   offUpdatePlayers: (callback: (players: UpdatePlayersPayload) => void) => void;
   onRemovePlayer: (callback: (id: string) => void) => void;
   offRemovePlayer: (callback: (id: string) => void) => void;
-  onUpdateMapCells: (callback: (updates: gridMapTypes.CellUpdate[]) => void) => void;
-  offUpdateMapCells: (callback: (updates: gridMapTypes.CellUpdate[]) => void) => void;
+  onUpdateMapCells: (callback: (updates: UpdateMapCellsPayload) => void) => void;
+  offUpdateMapCells: (callback: (updates: UpdateMapCellsPayload) => void) => void;
   onGameStart: (callback: (data: { startTime: number }) => void) => void;
   offGameStart: (callback: (data: { startTime: number }) => void) => void;
   sendMove: (x: number, y: number) => void;
diff --git a/apps/client/src/scenes/game/application/GameNetworkSync.ts b/apps/client/src/scenes/game/application/GameNetworkSync.ts
index 45b6e07..6a0e349 100644
--- a/apps/client/src/scenes/game/application/GameNetworkSync.ts
+++ b/apps/client/src/scenes/game/application/GameNetworkSync.ts
@@ -4,7 +4,7 @@
  * プレイヤー生成更新削除とマップ更新購読を管理する
  */
 import { Container } from "pixi.js";
-import type { playerTypes } from "@repo/shared";
+import type { playerTypes, CurrentPlayersPayload, UpdateMapCellsPayload } from "@repo/shared";
 import { socketManager } from "@client/network/SocketManager";
 import { LocalPlayerController, RemotePlayerController } from "@client/scenes/game/entities/player/PlayerController";
 import { GameMapController } from "@client/scenes/game/entities/map/GameMapController";
@@ -27,9 +27,8 @@
   private onGameStart: (startTime: number) => void;
   private isBound = false;
 
-  private handleCurrentPlayers = (serverPlayers: playerTypes.PlayerData[] | Record<string, playerTypes.PlayerData>) => {
-    const playersArray = (Array.isArray(serverPlayers) ? serverPlayers : Object.values(serverPlayers)) as playerTypes.PlayerData[];
-    playersArray.forEach((p) => {
+  private handleCurrentPlayers = (serverPlayers: CurrentPlayersPayload) => {
+    serverPlayers.forEach((p) => {
       const playerController = p.id === this.myId ? new LocalPlayerController(p) : new RemotePlayerController(p);
       this.worldContainer.addChild(playerController.getDisplayObject());
       this.players[p.id] = playerController;
@@ -70,7 +69,7 @@
     }
   };
 
-  private handleUpdateMapCells = (updates: Parameters<GameMapController["updateCells"]>[0]) => {
+  private handleUpdateMapCells = (updates: UpdateMapCellsPayload) => {
     this.gameMap.updateCells(updates);
   };
 
diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 617d04b..6708616 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -2,7 +2,14 @@
  * gameUseCasePorts
  * ゲーム系ユースケースが利用する入力ポートと出力ポートの契約を定義する
  */
-import type { gameTypes, gridMapTypes, playerTypes, roomTypes, UpdatePlayersPayload } from "@repo/shared";
+import type {
+  gameTypes,
+  playerTypes,
+  roomTypes,
+  CurrentPlayersPayload,
+  UpdateMapCellsPayload,
+  UpdatePlayersPayload,
+} from "@repo/shared";
 
 /** ゲーム開始ユースケースが利用するゲーム管理入力ポート */
 export interface StartGamePort {
@@ -52,11 +59,11 @@
   ): void;
   publishMapCellUpdatesToRoom(
     roomId: roomTypes.Room["roomId"],
-    cellUpdates: gridMapTypes.CellUpdate[]
+    cellUpdates: UpdateMapCellsPayload
   ): void;
   publishGameEndToRoom(roomId: roomTypes.Room["roomId"]): void;
   publishGameStartToRoom(roomId: roomTypes.Room["roomId"], payload: { startTime: number }): void;
-  publishCurrentPlayersToSocket(players: playerTypes.PlayerData[]): void;
+  publishCurrentPlayersToSocket(players: CurrentPlayersPayload): void;
   publishGameStartToSocket(payload: { startTime: number }): void;
   publishPlayerRemovedToRoom(roomId: roomTypes.Room["roomId"], removedPlayerId: string): void;
 }
diff --git a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
index 58310c4..d152965 100644
--- a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
+++ b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
@@ -4,7 +4,13 @@
  */
 import { Server } from "socket.io";
 import { protocol } from "@repo/shared";
-import type { gridMapTypes, playerTypes, roomTypes, UpdatePlayersPayload } from "@repo/shared";
+import type {
+  playerTypes,
+  roomTypes,
+  CurrentPlayersPayload,
+  UpdateMapCellsPayload,
+  UpdatePlayersPayload,
+} from "@repo/shared";
 import type { GameOutputPort } from "@server/domains/game/application/ports/gameUseCasePorts";
 import { createEmitToRoom } from "@server/network/adapters/socketEmitters";
 import type { CommonHandlerContext } from "../CommonHandler";
@@ -13,8 +19,6 @@
 type SocketId = playerTypes.PlayerData["id"];
 type PongPayload = { clientTime: number; serverTime: number };
 type GameStartPayload = { startTime: number };
-type CurrentPlayersPayload = playerTypes.PlayerData[];
-type MapCellUpdatesPayload = gridMapTypes.CellUpdate[];
 
 /** ゲーム出力アダプターのインターフェース */
 export type GameOutputAdapter = Omit<GameOutputPort, "publishPlayerRemovedToRoom">;
@@ -31,7 +35,7 @@
     publishUpdatePlayersToRoom: (roomId: RoomId, players: UpdatePlayersPayload) => {
       common.emitToRoom(roomId, protocol.SocketEvents.UPDATE_PLAYERS, players);
     },
-    publishMapCellUpdatesToRoom: (roomId: RoomId, cellUpdates: MapCellUpdatesPayload) => {
+    publishMapCellUpdatesToRoom: (roomId: RoomId, cellUpdates: UpdateMapCellsPayload) => {
       common.emitToRoom(roomId, protocol.SocketEvents.UPDATE_MAP_CELLS, cellUpdates);
     },
     publishGameEndToRoom: (roomId: RoomId) => {
diff --git a/packages/shared/src/index.ts b/packages/shared/src/index.ts
index 48c6e17..4f3646a 100644
--- a/packages/shared/src/index.ts
+++ b/packages/shared/src/index.ts
@@ -8,5 +8,9 @@
 export * as roomTypes from "./domains/room/room.type";
 export * as roomConsts from "./domains/room/room.const";
 export * as protocol from "./protocol/events";
-export type { UpdatePlayersPayload } from "./protocol/events";
+export type {
+	CurrentPlayersPayload,
+	UpdateMapCellsPayload,
+	UpdatePlayersPayload,
+} from "./protocol/events";
 export * as config from "./config";
\ No newline at end of file
diff --git a/packages/shared/src/protocol/events.ts b/packages/shared/src/protocol/events.ts
index 28a710f..d64eb18 100644
--- a/packages/shared/src/protocol/events.ts
+++ b/packages/shared/src/protocol/events.ts
@@ -36,3 +36,9 @@
 
 /** UPDATE_PLAYERS イベントで送受信するプレイヤー差分配列 */
 export type UpdatePlayersPayload = TickData["playerUpdates"];
+
+/** CURRENT_PLAYERS イベントで送受信するプレイヤー一覧 */
+export type CurrentPlayersPayload = TickData["playerUpdates"];
+
+/** UPDATE_MAP_CELLS イベントで送受信するマップ差分配列 */
+export type UpdateMapCellsPayload = TickData["cellUpdates"];