diff --git a/apps/server/src/logging/logEventGroups.ts b/apps/server/src/logging/logEventGroups.ts
new file mode 100644
index 0000000..450e7f1
--- /dev/null
+++ b/apps/server/src/logging/logEventGroups.ts
@@ -0,0 +1,39 @@
+/**
+ * logEventGroups
+ * ログ出力で利用するイベント名定数群を提供する
+ */
+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;
diff --git a/apps/server/src/logging/logEvents.ts b/apps/server/src/logging/logEvents.ts
index d672902..12cc4ad 100644
--- a/apps/server/src/logging/logEvents.ts
+++ b/apps/server/src/logging/logEvents.ts
@@ -1,249 +1,22 @@
 /**
  * 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
+ * ログ関連の定数と型契約を集約して再公開する
  */
-import { protocol } from "@repo/shared";
 
-/** ログ出力で利用するスコープ名の共通定数 */
-export const logScopes = {
-  NETWORK: "Network",
-  GAME_USE_CASE: "GameUseCase",
-  ROOM_USE_CASE: "RoomUseCase",
-  GAME_LOOP: "GameLoop",
-  GAME_ROOM_SESSION: "GameRoomSession",
-  GAME_PLAYER_OPERATION_SERVICE: "GamePlayerOperationService",
-  GAME_SESSION_LIFECYCLE_SERVICE: "GameSessionLifecycleService",
-  ROOM_JOIN_SERVICE: "RoomJoinService",
-  ROOM_EXIT_SERVICE: "RoomExitService",
-} as const;
+/** ログスコープ定数と型を再公開 */
+export { logScopes } from "./logScopes";
+export type { LogScope } from "./logScopes";
 
-/** 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;
+/** ログイベント定数群を再公開 */
+export {
+  gameUseCaseLogEvents,
+  roomUseCaseLogEvents,
+  gameDomainLogEvents,
+  roomDomainLogEvents,
+} from "./logEventGroups";
 
-/** 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;
+/** ログ結果値定数を再公開 */
+export { logResults } from "./logResults";
 
-/** 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;
-
-/** ログ出力で利用する結果値の共通定数 */
-export const logResults = {
-  ACCEPTED: "accepted",
-  CONNECTED: "connected",
-  CREATED: "created",
-  DELETED: "deleted",
-  DISCONNECTED: "disconnected",
-  EMITTED: "emitted",
-  IGNORED_ALREADY_PLAYING: "ignored_already_playing",
-  IGNORED_ALREADY_RUNNING: "ignored_already_running",
-  IGNORED_DUPLICATE: "ignored_duplicate",
-  IGNORED_INVALID_PAYLOAD: "ignored_invalid_payload",
-  IGNORED_MISSING_ROOM: "ignored_missing_room",
-  IGNORED_NO_ROOM: "ignored_no_room",
-  IGNORED_PLAYER_NOT_FOUND: "ignored_player_not_found",
-  IGNORED_PLAYER_NOT_IN_SESSION: "ignored_player_not_in_session",
-  IGNORED_ROOM_FULL: "ignored_room_full",
-  IGNORED_ROOM_NOT_FOUND: "ignored_room_not_found",
-  JOINED: "joined",
-  PLAYER_REMOVED: "player_removed",
-  PROCESSED: "processed",
-  RECEIVED: "received",
-  REJECTED: "rejected",
-  REJECTED_DUPLICATE: "rejected_duplicate",
-  REJECTED_ROOM_FULL: "rejected_room_full",
-  REMOVED: "removed",
-  SESSION_DISPOSED_EMPTY_ROOM: "session_disposed_empty_room",
-  STARTED: "started",
-  STOPPED: "stopped",
-  TRANSFERRED: "transferred",
-} as const;
-
-/** ログ出力で利用するスコープ名型 */
-export type LogScope = (typeof logScopes)[keyof typeof logScopes];
-
-type ValueOf<T> = T[keyof T];
-
-/** スコープごとの event/result と必須項目の型契約 */
-export type LogPayloadByScope = {
-  [logScopes.NETWORK]:
-    | {
-        event: typeof protocol.SocketEvents.CONNECT;
-        result: typeof logResults.CONNECTED;
-        socketId: string;
-      }
-    | {
-        event: typeof protocol.SocketEvents.DISCONNECT;
-        result: typeof logResults.DISCONNECTED;
-        socketId: string;
-      }
-    | {
-        event: typeof protocol.SocketEvents.JOIN_ROOM;
-        result:
-          | typeof logResults.REJECTED_ROOM_FULL
-          | typeof logResults.REJECTED_DUPLICATE
-          | typeof logResults.IGNORED_INVALID_PAYLOAD;
-        socketId: string;
-        roomId?: string;
-      }
-    | {
-        event: typeof protocol.SocketEvents.PING;
-        result: typeof logResults.IGNORED_INVALID_PAYLOAD;
-        socketId: string;
-      }
-    | {
-        event: typeof protocol.SocketEvents.MOVE;
-        result: typeof logResults.IGNORED_INVALID_PAYLOAD;
-        socketId: string;
-      };
-  [logScopes.GAME_USE_CASE]:
-    | {
-        event: typeof gameUseCaseLogEvents.START_GAME;
-        result:
-          | typeof logResults.IGNORED_NO_ROOM
-          | typeof logResults.IGNORED_ALREADY_PLAYING
-          | typeof logResults.IGNORED_ROOM_NOT_FOUND
-          | typeof logResults.ACCEPTED;
-        socketId: string;
-        roomId?: string;
-      }
-    | {
-        event: typeof gameUseCaseLogEvents.READY_FOR_GAME;
-        result:
-          | typeof logResults.IGNORED_MISSING_ROOM
-          | typeof logResults.RECEIVED;
-        socketId: string;
-        roomId?: string;
-      }
-    | {
-        event: typeof gameUseCaseLogEvents.GAME_START;
-        result: typeof logResults.EMITTED;
-        socketId: string;
-        roomId: string;
-      }
-    | {
-        event: typeof gameUseCaseLogEvents.GAME_END;
-        result: typeof logResults.EMITTED;
-        roomId: string;
-      }
-    | {
-        event: typeof gameUseCaseLogEvents.DISCONNECT;
-        result: typeof logResults.PLAYER_REMOVED;
-        socketId: string;
-      };
-  [logScopes.ROOM_USE_CASE]:
-    | {
-        event: typeof roomUseCaseLogEvents.JOIN_ROOM;
-        result:
-          | typeof logResults.RECEIVED
-          | typeof logResults.REJECTED;
-        socketId: string;
-        roomId: string;
-      }
-    | {
-        event: typeof roomUseCaseLogEvents.DISCONNECT;
-        result: typeof logResults.PROCESSED;
-        socketId: string;
-      }
-    | {
-        event: typeof roomUseCaseLogEvents.ROOM_UPDATE;
-        result: typeof logResults.EMITTED;
-        socketId: string;
-        roomId: string;
-      };
-  [logScopes.GAME_LOOP]: {
-    event: typeof gameDomainLogEvents.GAME_LOOP;
-    result:
-      | typeof logResults.STARTED
-      | typeof logResults.STOPPED;
-    roomId: string;
-  };
-  [logScopes.GAME_ROOM_SESSION]: {
-    event: typeof gameDomainLogEvents.MOVE;
-    result:
-      | typeof logResults.IGNORED_PLAYER_NOT_FOUND
-      | typeof logResults.IGNORED_INVALID_PAYLOAD;
-    roomId: string;
-    socketId: string;
-  };
-  [logScopes.GAME_PLAYER_OPERATION_SERVICE]:
-    | {
-        event: typeof gameDomainLogEvents.PLAYER_MOVE;
-        result: typeof logResults.IGNORED_PLAYER_NOT_IN_SESSION;
-        socketId: string;
-      }
-    | {
-        event: typeof gameDomainLogEvents.PLAYER_REMOVE;
-        result:
-          | typeof logResults.IGNORED_PLAYER_NOT_IN_SESSION
-          | typeof logResults.SESSION_DISPOSED_EMPTY_ROOM;
-        socketId: string;
-        roomId?: string;
-      };
-  [logScopes.GAME_SESSION_LIFECYCLE_SERVICE]: {
-    event: typeof gameDomainLogEvents.SESSION_START;
-    result:
-      | typeof logResults.IGNORED_ALREADY_RUNNING
-      | typeof logResults.STARTED;
-    roomId: string;
-  };
-  [logScopes.ROOM_JOIN_SERVICE]:
-    | {
-        event: typeof roomDomainLogEvents.ROOM_CREATE;
-        result: typeof logResults.CREATED;
-        roomId: string;
-        socketId: string;
-      }
-    | {
-        event: typeof roomDomainLogEvents.PLAYER_JOIN;
-        result:
-          | typeof logResults.IGNORED_DUPLICATE
-          | typeof logResults.IGNORED_ROOM_FULL
-          | typeof logResults.JOINED;
-        roomId: string;
-        socketId: string;
-      };
-  [logScopes.ROOM_EXIT_SERVICE]:
-    | {
-        event: typeof roomDomainLogEvents.PLAYER_LEAVE;
-        result: typeof logResults.REMOVED;
-        roomId: string;
-        socketId: string;
-      }
-    | {
-        event: typeof roomDomainLogEvents.ROOM_DELETE;
-        result: typeof logResults.DELETED;
-        roomId: string;
-        socketId: string;
-      }
-    | {
-        event: typeof roomDomainLogEvents.OWNER_TRANSFER;
-        result: typeof logResults.TRANSFERRED;
-        roomId: string;
-        socketId: string;
-      };
-};
+/** ログペイロード契約型を再公開 */
+export type { LogPayloadByScope, LogPayloadOf } from "./logPayloadContracts";
diff --git a/apps/server/src/logging/logPayloadContracts.ts b/apps/server/src/logging/logPayloadContracts.ts
new file mode 100644
index 0000000..ed2eeb1
--- /dev/null
+++ b/apps/server/src/logging/logPayloadContracts.ts
@@ -0,0 +1,171 @@
+/**
+ * logPayloadContracts
+ * スコープごとのログペイロード型契約を提供する
+ */
+import { protocol } from "@repo/shared";
+import { gameDomainLogEvents, gameUseCaseLogEvents, roomDomainLogEvents, roomUseCaseLogEvents } from "./logEventGroups";
+import { logResults } from "./logResults";
+import { logScopes, type LogScope } from "./logScopes";
+
+/** スコープごとの event/result と必須項目の型契約 */
+export type LogPayloadByScope = {
+  [logScopes.NETWORK]:
+    | {
+        event: typeof protocol.SocketEvents.CONNECT;
+        result: typeof logResults.CONNECTED;
+        socketId: string;
+      }
+    | {
+        event: typeof protocol.SocketEvents.DISCONNECT;
+        result: typeof logResults.DISCONNECTED;
+        socketId: string;
+      }
+    | {
+        event: typeof protocol.SocketEvents.JOIN_ROOM;
+        result:
+          | typeof logResults.REJECTED_ROOM_FULL
+          | typeof logResults.REJECTED_DUPLICATE
+          | typeof logResults.IGNORED_INVALID_PAYLOAD;
+        socketId: string;
+        roomId?: string;
+      }
+    | {
+        event: typeof protocol.SocketEvents.PING;
+        result: typeof logResults.IGNORED_INVALID_PAYLOAD;
+        socketId: string;
+      }
+    | {
+        event: typeof protocol.SocketEvents.MOVE;
+        result: typeof logResults.IGNORED_INVALID_PAYLOAD;
+        socketId: string;
+      };
+  [logScopes.GAME_USE_CASE]:
+    | {
+        event: typeof gameUseCaseLogEvents.START_GAME;
+        result:
+          | typeof logResults.IGNORED_NO_ROOM
+          | typeof logResults.IGNORED_ALREADY_PLAYING
+          | typeof logResults.IGNORED_ROOM_NOT_FOUND
+          | typeof logResults.ACCEPTED;
+        socketId: string;
+        roomId?: string;
+      }
+    | {
+        event: typeof gameUseCaseLogEvents.READY_FOR_GAME;
+        result:
+          | typeof logResults.IGNORED_MISSING_ROOM
+          | typeof logResults.RECEIVED;
+        socketId: string;
+        roomId?: string;
+      }
+    | {
+        event: typeof gameUseCaseLogEvents.GAME_START;
+        result: typeof logResults.EMITTED;
+        socketId: string;
+        roomId: string;
+      }
+    | {
+        event: typeof gameUseCaseLogEvents.GAME_END;
+        result: typeof logResults.EMITTED;
+        roomId: string;
+      }
+    | {
+        event: typeof gameUseCaseLogEvents.DISCONNECT;
+        result: typeof logResults.PLAYER_REMOVED;
+        socketId: string;
+      };
+  [logScopes.ROOM_USE_CASE]:
+    | {
+        event: typeof roomUseCaseLogEvents.JOIN_ROOM;
+        result:
+          | typeof logResults.RECEIVED
+          | typeof logResults.REJECTED;
+        socketId: string;
+        roomId: string;
+      }
+    | {
+        event: typeof roomUseCaseLogEvents.DISCONNECT;
+        result: typeof logResults.PROCESSED;
+        socketId: string;
+      }
+    | {
+        event: typeof roomUseCaseLogEvents.ROOM_UPDATE;
+        result: typeof logResults.EMITTED;
+        socketId: string;
+        roomId: string;
+      };
+  [logScopes.GAME_LOOP]: {
+    event: typeof gameDomainLogEvents.GAME_LOOP;
+    result:
+      | typeof logResults.STARTED
+      | typeof logResults.STOPPED;
+    roomId: string;
+  };
+  [logScopes.GAME_ROOM_SESSION]: {
+    event: typeof gameDomainLogEvents.MOVE;
+    result:
+      | typeof logResults.IGNORED_PLAYER_NOT_FOUND
+      | typeof logResults.IGNORED_INVALID_PAYLOAD;
+    roomId: string;
+    socketId: string;
+  };
+  [logScopes.GAME_PLAYER_OPERATION_SERVICE]:
+    | {
+        event: typeof gameDomainLogEvents.PLAYER_MOVE;
+        result: typeof logResults.IGNORED_PLAYER_NOT_IN_SESSION;
+        socketId: string;
+      }
+    | {
+        event: typeof gameDomainLogEvents.PLAYER_REMOVE;
+        result:
+          | typeof logResults.IGNORED_PLAYER_NOT_IN_SESSION
+          | typeof logResults.SESSION_DISPOSED_EMPTY_ROOM;
+        socketId: string;
+        roomId?: string;
+      };
+  [logScopes.GAME_SESSION_LIFECYCLE_SERVICE]: {
+    event: typeof gameDomainLogEvents.SESSION_START;
+    result:
+      | typeof logResults.IGNORED_ALREADY_RUNNING
+      | typeof logResults.STARTED;
+    roomId: string;
+  };
+  [logScopes.ROOM_JOIN_SERVICE]:
+    | {
+        event: typeof roomDomainLogEvents.ROOM_CREATE;
+        result: typeof logResults.CREATED;
+        roomId: string;
+        socketId: string;
+      }
+    | {
+        event: typeof roomDomainLogEvents.PLAYER_JOIN;
+        result:
+          | typeof logResults.IGNORED_DUPLICATE
+          | typeof logResults.IGNORED_ROOM_FULL
+          | typeof logResults.JOINED;
+        roomId: string;
+        socketId: string;
+      };
+  [logScopes.ROOM_EXIT_SERVICE]:
+    | {
+        event: typeof roomDomainLogEvents.PLAYER_LEAVE;
+        result: typeof logResults.REMOVED;
+        roomId: string;
+        socketId: string;
+      }
+    | {
+        event: typeof roomDomainLogEvents.ROOM_DELETE;
+        result: typeof logResults.DELETED;
+        roomId: string;
+        socketId: string;
+      }
+    | {
+        event: typeof roomDomainLogEvents.OWNER_TRANSFER;
+        result: typeof logResults.TRANSFERRED;
+        roomId: string;
+        socketId: string;
+      };
+};
+
+/** スコープごとのログペイロード型を参照するユーティリティ */
+export type LogPayloadOf<TScope extends LogScope> = LogPayloadByScope[TScope];
diff --git a/apps/server/src/logging/logResults.ts b/apps/server/src/logging/logResults.ts
new file mode 100644
index 0000000..b666332
--- /dev/null
+++ b/apps/server/src/logging/logResults.ts
@@ -0,0 +1,36 @@
+/**
+ * logResults
+ * ログ出力で利用する結果値定数を提供する
+ */
+
+/** ログ出力で利用する結果値の共通定数 */
+export const logResults = {
+  ACCEPTED: "accepted",
+  CONNECTED: "connected",
+  CREATED: "created",
+  DELETED: "deleted",
+  DISCONNECTED: "disconnected",
+  EMITTED: "emitted",
+  IGNORED_ALREADY_PLAYING: "ignored_already_playing",
+  IGNORED_ALREADY_RUNNING: "ignored_already_running",
+  IGNORED_DUPLICATE: "ignored_duplicate",
+  IGNORED_INVALID_PAYLOAD: "ignored_invalid_payload",
+  IGNORED_MISSING_ROOM: "ignored_missing_room",
+  IGNORED_NO_ROOM: "ignored_no_room",
+  IGNORED_PLAYER_NOT_FOUND: "ignored_player_not_found",
+  IGNORED_PLAYER_NOT_IN_SESSION: "ignored_player_not_in_session",
+  IGNORED_ROOM_FULL: "ignored_room_full",
+  IGNORED_ROOM_NOT_FOUND: "ignored_room_not_found",
+  JOINED: "joined",
+  PLAYER_REMOVED: "player_removed",
+  PROCESSED: "processed",
+  RECEIVED: "received",
+  REJECTED: "rejected",
+  REJECTED_DUPLICATE: "rejected_duplicate",
+  REJECTED_ROOM_FULL: "rejected_room_full",
+  REMOVED: "removed",
+  SESSION_DISPOSED_EMPTY_ROOM: "session_disposed_empty_room",
+  STARTED: "started",
+  STOPPED: "stopped",
+  TRANSFERRED: "transferred",
+} as const;
diff --git a/apps/server/src/logging/logScopes.ts b/apps/server/src/logging/logScopes.ts
new file mode 100644
index 0000000..7005f4a
--- /dev/null
+++ b/apps/server/src/logging/logScopes.ts
@@ -0,0 +1,20 @@
+/**
+ * logScopes
+ * ログ出力で利用するスコープ名定数と型を提供する
+ */
+
+/** ログ出力で利用するスコープ名の共通定数 */
+export const logScopes = {
+  NETWORK: "Network",
+  GAME_USE_CASE: "GameUseCase",
+  ROOM_USE_CASE: "RoomUseCase",
+  GAME_LOOP: "GameLoop",
+  GAME_ROOM_SESSION: "GameRoomSession",
+  GAME_PLAYER_OPERATION_SERVICE: "GamePlayerOperationService",
+  GAME_SESSION_LIFECYCLE_SERVICE: "GameSessionLifecycleService",
+  ROOM_JOIN_SERVICE: "RoomJoinService",
+  ROOM_EXIT_SERVICE: "RoomExitService",
+} as const;
+
+/** ログ出力で利用するスコープ名型 */
+export type LogScope = (typeof logScopes)[keyof typeof logScopes];