diff --git a/apps/server/src/application/coordinators/startGameCoordinator.ts b/apps/server/src/application/coordinators/startGameCoordinator.ts
index cddf474..6bf674a 100644
--- a/apps/server/src/application/coordinators/startGameCoordinator.ts
+++ b/apps/server/src/application/coordinators/startGameCoordinator.ts
@@ -9,6 +9,7 @@
 } from "@server/domains/game/application/ports/gameUseCasePorts";
 import { startGameUseCase } from "@server/domains/game/application/useCases/startGameUseCase";
 import { logEvent } from "@server/logging/logEvent";
+import { gameUseCaseLogEvents } from "@server/logging/logEvents";
 import { roomConsts } from "@repo/shared";
 
 type StartGameCoordinatorParams = {
@@ -34,7 +35,7 @@
   const room = roomManager.getRoomByOwnerId(ownerId);
   if (!room) {
     logEvent("GameUseCase", {
-      event: "START_GAME",
+      event: gameUseCaseLogEvents.START_GAME,
       result: "ignored_no_room",
       socketId: ownerId,
     });
@@ -43,7 +44,7 @@
 
   if (room.status === roomConsts.RoomPhase.PLAYING) {
     logEvent("GameUseCase", {
-      event: "START_GAME",
+      event: gameUseCaseLogEvents.START_GAME,
       result: "ignored_already_playing",
       roomId: room.roomId,
       socketId: ownerId,
@@ -54,7 +55,7 @@
   const updatedRoom = roomManager.markRoomPlaying(room.roomId);
   if (!updatedRoom) {
     logEvent("GameUseCase", {
-      event: "START_GAME",
+      event: gameUseCaseLogEvents.START_GAME,
       result: "ignored_room_not_found",
       roomId: room.roomId,
       socketId: ownerId,
@@ -63,7 +64,7 @@
   }
 
   logEvent("GameUseCase", {
-    event: "START_GAME",
+    event: gameUseCaseLogEvents.START_GAME,
     result: "accepted",
     roomId: updatedRoom.roomId,
     socketId: ownerId,
diff --git a/apps/server/src/domains/game/application/services/GamePlayerOperationService.ts b/apps/server/src/domains/game/application/services/GamePlayerOperationService.ts
index 9874b80..787b4f4 100644
--- a/apps/server/src/domains/game/application/services/GamePlayerOperationService.ts
+++ b/apps/server/src/domains/game/application/services/GamePlayerOperationService.ts
@@ -3,6 +3,7 @@
  * ゲームセッション内のプレイヤー移動と離脱操作を管理する
  */
 import { logEvent } from "@server/logging/logEvent";
+import { gameDomainLogEvents } from "@server/logging/logEvents";
 import { GameRoomSession } from "./GameRoomSession";
 
 type SessionStore = Map<string, GameRoomSession>;
@@ -21,7 +22,7 @@
     const roomId = this.playerToRoom.get(id);
     if (!roomId) {
       logEvent("GamePlayerOperationService", {
-        event: "PLAYER_MOVE",
+        event: gameDomainLogEvents.PLAYER_MOVE,
         result: "ignored_player_not_in_session",
         socketId: id,
       });
@@ -35,7 +36,7 @@
     const roomId = this.playerToRoom.get(id);
     if (!roomId) {
       logEvent("GamePlayerOperationService", {
-        event: "PLAYER_REMOVE",
+        event: gameDomainLogEvents.PLAYER_REMOVE,
         result: "ignored_player_not_in_session",
         socketId: id,
       });
@@ -57,7 +58,7 @@
       this.sessions.delete(roomId);
       this.roomToPlayers.delete(roomId);
       logEvent("GamePlayerOperationService", {
-        event: "PLAYER_REMOVE",
+        event: gameDomainLogEvents.PLAYER_REMOVE,
         result: "session_disposed_empty_room",
         roomId,
         socketId: id,
diff --git a/apps/server/src/domains/game/application/services/GameRoomSession.ts b/apps/server/src/domains/game/application/services/GameRoomSession.ts
index efe7e8e..94ee207 100644
--- a/apps/server/src/domains/game/application/services/GameRoomSession.ts
+++ b/apps/server/src/domains/game/application/services/GameRoomSession.ts
@@ -3,6 +3,7 @@
  * 1ルーム分のゲーム進行状態とゲームループ実行を管理する
  */
 import { logEvent } from "@server/logging/logEvent";
+import { gameDomainLogEvents } from "@server/logging/logEvents";
 import type { gameTypes } from "@repo/shared";
 import { GameLoop } from "../../loop/GameLoop";
 import { Player } from "../../entities/player/Player.js";
@@ -59,7 +60,7 @@
     const player = this.players.get(id);
     if (!player) {
       logEvent("GameRoomSession", {
-        event: "MOVE",
+        event: gameDomainLogEvents.MOVE,
         result: "ignored_player_not_found",
         roomId: this.roomId,
         socketId: id,
@@ -69,7 +70,7 @@
 
     if (!isValidPosition(x, y)) {
       logEvent("GameRoomSession", {
-        event: "MOVE",
+        event: gameDomainLogEvents.MOVE,
         result: "ignored_invalid_payload",
         roomId: this.roomId,
         socketId: id,
diff --git a/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts b/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
index 7cc15e3..6381a47 100644
--- a/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
+++ b/apps/server/src/domains/game/application/services/GameSessionLifecycleService.ts
@@ -5,6 +5,7 @@
 import { config } from "@repo/shared";
 import type { gameTypes } from "@repo/shared";
 import { logEvent } from "@server/logging/logEvent";
+import { gameDomainLogEvents } from "@server/logging/logEvents";
 import { GameRoomSession } from "./GameRoomSession";
 
 type SessionStore = Map<string, GameRoomSession>;
@@ -35,7 +36,7 @@
   ) {
     if (this.sessions.has(roomId)) {
       logEvent("GameSessionLifecycleService", {
-        event: "SESSION_START",
+        event: gameDomainLogEvents.SESSION_START,
         result: "ignored_already_running",
         roomId,
       });
@@ -59,7 +60,7 @@
     });
 
     logEvent("GameSessionLifecycleService", {
-      event: "SESSION_START",
+      event: gameDomainLogEvents.SESSION_START,
       result: "started",
       roomId,
       playerCount: playerIds.length,
diff --git a/apps/server/src/domains/game/application/useCases/disconnectUseCase.ts b/apps/server/src/domains/game/application/useCases/disconnectUseCase.ts
index bb6ca19..f78a1ce 100644
--- a/apps/server/src/domains/game/application/useCases/disconnectUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/disconnectUseCase.ts
@@ -4,6 +4,7 @@
  */
 import type { DisconnectPlayerPort, GameOutputPort } from "../ports/gameUseCasePorts";
 import { logEvent } from "@server/logging/logEvent";
+import { gameUseCaseLogEvents } from "@server/logging/logEvents";
 
 type DisconnectUseCaseParams = {
   gameManager: DisconnectPlayerPort;
@@ -26,7 +27,7 @@
   }
 
   logEvent("GameUseCase", {
-    event: "DISCONNECT",
+    event: gameUseCaseLogEvents.DISCONNECT,
     result: "player_removed",
     socketId: playerId,
   });
diff --git a/apps/server/src/domains/game/application/useCases/readyForGameUseCase.ts b/apps/server/src/domains/game/application/useCases/readyForGameUseCase.ts
index f4696ad..1d5321c 100644
--- a/apps/server/src/domains/game/application/useCases/readyForGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/readyForGameUseCase.ts
@@ -5,6 +5,7 @@
 import type { ReadyForGamePort } from "../ports/gameUseCasePorts";
 import type { GameOutputPort } from "../ports/gameUseCasePorts";
 import { logEvent } from "@server/logging/logEvent";
+import { gameUseCaseLogEvents } from "@server/logging/logEvents";
 
 type ReadyForGameUseCaseParams = {
   socketId: string;
@@ -23,7 +24,7 @@
   if (!roomId) {
     output.publishCurrentPlayersToSocket([]);
     logEvent("GameUseCase", {
-      event: "READY_FOR_GAME",
+      event: gameUseCaseLogEvents.READY_FOR_GAME,
       result: "ignored_missing_room",
       socketId,
     });
@@ -34,7 +35,7 @@
   output.publishCurrentPlayersToSocket(roomPlayers);
 
   logEvent("GameUseCase", {
-    event: "READY_FOR_GAME",
+    event: gameUseCaseLogEvents.READY_FOR_GAME,
     result: "received",
     socketId,
     roomId,
@@ -48,7 +49,7 @@
 
   output.publishGameStartToSocket({ startTime });
   logEvent("GameUseCase", {
-    event: "GAME_START",
+    event: gameUseCaseLogEvents.GAME_START,
     result: "emitted",
     socketId,
     roomId,
diff --git a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
index d6e871f..b02cf59 100644
--- a/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/startGameUseCase.ts
@@ -4,6 +4,7 @@
  */
 import type { GameOutputPort, StartGamePort } from "../ports/gameUseCasePorts";
 import { logEvent } from "@server/logging/logEvent";
+import { gameUseCaseLogEvents } from "@server/logging/logEvents";
 
 type StartGameUseCaseParams = {
   roomId: string;
@@ -41,7 +42,7 @@
     },
     () => {
       logEvent("GameUseCase", {
-        event: "GAME_END",
+        event: gameUseCaseLogEvents.GAME_END,
         result: "emitted",
         roomId,
         reason: "duration_elapsed",
diff --git a/apps/server/src/domains/game/loop/GameLoop.ts b/apps/server/src/domains/game/loop/GameLoop.ts
index 0ddb36e..86d4001 100644
--- a/apps/server/src/domains/game/loop/GameLoop.ts
+++ b/apps/server/src/domains/game/loop/GameLoop.ts
@@ -8,6 +8,7 @@
 import { config } from "@repo/shared";
 import type { gameTypes } from "@repo/shared";
 import { logEvent } from "@server/logging/logEvent";
+import { gameDomainLogEvents } from "@server/logging/logEvents";
 
 /** ルーム内ゲーム進行を定周期で実行するループ管理クラス */
 export class GameLoop {
@@ -41,7 +42,7 @@
     this.scheduleNextTick();
 
     logEvent("GameLoop", {
-      event: "GAME_LOOP",
+      event: gameDomainLogEvents.GAME_LOOP,
       result: "started",
       roomId: this.roomId,
       tickRate: this.tickRate,
@@ -151,7 +152,7 @@
     }
 
     logEvent("GameLoop", {
-      event: "GAME_LOOP",
+      event: gameDomainLogEvents.GAME_LOOP,
       result: "stopped",
       roomId: this.roomId,
       elapsedMs: Math.max(0, Math.round(performance.now() - this.startMonotonicTimeMs)),
diff --git a/apps/server/src/domains/room/application/services/RoomExitService.ts b/apps/server/src/domains/room/application/services/RoomExitService.ts
index 36696e3..8b94508 100644
--- a/apps/server/src/domains/room/application/services/RoomExitService.ts
+++ b/apps/server/src/domains/room/application/services/RoomExitService.ts
@@ -4,6 +4,7 @@
  */
 import type { roomTypes } from "@repo/shared";
 import { logEvent } from "@server/logging/logEvent";
+import { roomDomainLogEvents } from "@server/logging/logEvents";
 
 /** 退出要求に応じてプレイヤー削除とルーム整理を行うサービス */
 export class RoomExitService {
@@ -20,7 +21,7 @@
 
       room.players.splice(playerIndex, 1);
       logEvent("RoomExitService", {
-        event: "PLAYER_LEAVE",
+        event: roomDomainLogEvents.PLAYER_LEAVE,
         result: "removed",
         roomId,
         socketId,
@@ -30,7 +31,7 @@
       if (room.players.length === 0) {
         this.rooms.delete(roomId);
         logEvent("RoomExitService", {
-          event: "ROOM_DELETE",
+          event: roomDomainLogEvents.ROOM_DELETE,
           result: "deleted",
           roomId,
           socketId,
@@ -42,7 +43,7 @@
         room.ownerId = room.players[0].id;
         room.players[0].isOwner = true;
         logEvent("RoomExitService", {
-          event: "OWNER_TRANSFER",
+          event: roomDomainLogEvents.OWNER_TRANSFER,
           result: "transferred",
           roomId,
           socketId,
diff --git a/apps/server/src/domains/room/application/services/RoomJoinService.ts b/apps/server/src/domains/room/application/services/RoomJoinService.ts
index d096dcc..cb21ffd 100644
--- a/apps/server/src/domains/room/application/services/RoomJoinService.ts
+++ b/apps/server/src/domains/room/application/services/RoomJoinService.ts
@@ -5,6 +5,7 @@
 import { config, roomConsts } from "@repo/shared";
 import type { roomTypes } from "@repo/shared";
 import { logEvent } from "@server/logging/logEvent";
+import { roomDomainLogEvents } from "@server/logging/logEvents";
 import type { JoinRoomResult } from "../ports/roomUseCasePorts";
 
 /** 参加要求に応じてルーム作成と参加者追加を行うサービス */
@@ -23,7 +24,7 @@
       };
       this.rooms.set(roomId, room);
       logEvent("RoomJoinService", {
-        event: "ROOM_CREATE",
+        event: roomDomainLogEvents.ROOM_CREATE,
         result: "created",
         roomId,
         socketId,
@@ -35,7 +36,7 @@
     const alreadyJoined = room.players.some((player) => player.id === socketId);
     if (alreadyJoined) {
       logEvent("RoomJoinService", {
-        event: "PLAYER_JOIN",
+        event: roomDomainLogEvents.PLAYER_JOIN,
         result: "ignored_duplicate",
         roomId,
         socketId,
@@ -47,7 +48,7 @@
     // ルーム満員時の参加を拒否する
     if (room.players.length >= room.maxPlayers) {
       logEvent("RoomJoinService", {
-        event: "PLAYER_JOIN",
+        event: roomDomainLogEvents.PLAYER_JOIN,
         result: "ignored_room_full",
         roomId,
         socketId,
@@ -66,7 +67,7 @@
 
     room.players.push(newPlayer);
     logEvent("RoomJoinService", {
-      event: "PLAYER_JOIN",
+      event: roomDomainLogEvents.PLAYER_JOIN,
       result: "joined",
       roomId,
       socketId,
diff --git a/apps/server/src/domains/room/application/useCases/joinRoomUseCase.ts b/apps/server/src/domains/room/application/useCases/joinRoomUseCase.ts
index 4f9a1fd..6da1059 100644
--- a/apps/server/src/domains/room/application/useCases/joinRoomUseCase.ts
+++ b/apps/server/src/domains/room/application/useCases/joinRoomUseCase.ts
@@ -9,6 +9,7 @@
   RoomOutputPort,
 } from "../ports/roomUseCasePorts";
 import { logEvent } from "@server/logging/logEvent";
+import { roomUseCaseLogEvents } from "@server/logging/logEvents";
 
 type JoinRoomUseCaseParams = {
   roomManager: JoinRoomPort;
@@ -26,7 +27,7 @@
 }: JoinRoomUseCaseParams): JoinRoomResult => {
   const { roomId, playerName } = data;
   logEvent("RoomUseCase", {
-    event: "JOIN_ROOM",
+    event: roomUseCaseLogEvents.JOIN_ROOM,
     result: "received",
     roomId,
     socketId,
@@ -41,7 +42,7 @@
     });
 
     logEvent("RoomUseCase", {
-      event: "JOIN_ROOM",
+      event: roomUseCaseLogEvents.JOIN_ROOM,
       result: "rejected",
       reason: joinResult.status,
       roomId,
diff --git a/apps/server/src/domains/room/application/useCases/roomDisconnectUseCase.ts b/apps/server/src/domains/room/application/useCases/roomDisconnectUseCase.ts
index 18b7aaf..919fdd9 100644
--- a/apps/server/src/domains/room/application/useCases/roomDisconnectUseCase.ts
+++ b/apps/server/src/domains/room/application/useCases/roomDisconnectUseCase.ts
@@ -5,6 +5,7 @@
 import type { DisconnectRoomPort } from "../ports/roomUseCasePorts";
 import type { RoomOutputPort } from "../ports/roomUseCasePorts";
 import { logEvent } from "@server/logging/logEvent";
+import { roomUseCaseLogEvents } from "@server/logging/logEvents";
 
 type RoomDisconnectUseCaseParams = {
   roomManager: DisconnectRoomPort;
@@ -20,7 +21,7 @@
 }: RoomDisconnectUseCaseParams) => {
   const updatedRooms = roomManager.removePlayer(socketId);
   logEvent("RoomUseCase", {
-    event: "DISCONNECT",
+    event: roomUseCaseLogEvents.DISCONNECT,
     result: "processed",
     socketId,
     updatedRoomCount: updatedRooms.length,
@@ -29,7 +30,7 @@
   updatedRooms.forEach((room) => {
     output.publishRoomUpdateToRoom(room.roomId, room);
     logEvent("RoomUseCase", {
-      event: "ROOM_UPDATE",
+      event: roomUseCaseLogEvents.ROOM_UPDATE,
       result: "emitted",
       roomId: room.roomId,
       socketId,
diff --git a/apps/server/src/logging/logEvents.ts b/apps/server/src/logging/logEvents.ts
new file mode 100644
index 0000000..55470da
--- /dev/null
+++ b/apps/server/src/logging/logEvents.ts
@@ -0,0 +1,39 @@
+/**
+ * logEvents
+ * アプリケーションログで利用するイベント名定数を提供する
+ */
+import { protocol } from "@repo/shared";
+
+/** GameUseCaseログで利用するイベント名定数 */
+export const gameUseCaseLogEvents = {
+  START_GAME: protocol.SocketEvents.START_GAME,
+  READY_FOR_GAME: protocol.SocketEvents.READY_FOR_GAME,
+  GAME_START: protocol.SocketEvents.GAME_START,
+  GAME_END: protocol.SocketEvents.GAME_END,
+  DISCONNECT: protocol.SocketEvents.DISCONNECT,
+} as const;
+
+/** RoomUseCaseログで利用するイベント名定数 */
+export const roomUseCaseLogEvents = {
+  JOIN_ROOM: protocol.SocketEvents.JOIN_ROOM,
+  DISCONNECT: protocol.SocketEvents.DISCONNECT,
+  ROOM_UPDATE: protocol.SocketEvents.ROOM_UPDATE,
+} as const;
+
+/** Gameドメインサービスとループログで利用するイベント名定数 */
+export const gameDomainLogEvents = {
+  MOVE: protocol.SocketEvents.MOVE,
+  SESSION_START: "SESSION_START",
+  PLAYER_MOVE: "PLAYER_MOVE",
+  PLAYER_REMOVE: "PLAYER_REMOVE",
+  GAME_LOOP: "GAME_LOOP",
+} as const;
+
+/** Roomドメインサービスログで利用するイベント名定数 */
+export const roomDomainLogEvents = {
+  ROOM_CREATE: "ROOM_CREATE",
+  PLAYER_JOIN: "PLAYER_JOIN",
+  PLAYER_LEAVE: "PLAYER_LEAVE",
+  ROOM_DELETE: "ROOM_DELETE",
+  OWNER_TRANSFER: "OWNER_TRANSFER",
+} as const;