diff --git a/apps/server/src/application/coordinators/coordinatorDeps.ts b/apps/server/src/application/coordinators/coordinatorDeps.ts
index d222a64..11cede5 100644
--- a/apps/server/src/application/coordinators/coordinatorDeps.ts
+++ b/apps/server/src/application/coordinators/coordinatorDeps.ts
@@ -4,6 +4,7 @@
  */
 import type {
   CleanupGameRuntimePort,
+  DeleteRoomPort,
   DisconnectRoomPort,
   FindGameByRoomPort,
   FindRoomByIdPort,
@@ -14,8 +15,8 @@
 
 /** START_GAME調停で利用する依存集合 */
 export type StartGameCoordinatorDeps = {
-  roomManager: FindRoomByOwnerPort & RoomPhaseTransitionPort;
-  runtimeRegistry: FindGameByRoomPort;
+  roomManager: FindRoomByOwnerPort & RoomPhaseTransitionPort & DeleteRoomPort;
+  runtimeRegistry: FindGameByRoomPort & CleanupGameRuntimePort;
 };
 
 /** READY_FOR_GAME調停で利用する依存集合 */
diff --git a/apps/server/src/application/coordinators/startGameCoordinator.ts b/apps/server/src/application/coordinators/startGameCoordinator.ts
index 4f0304c..72407a7 100644
--- a/apps/server/src/application/coordinators/startGameCoordinator.ts
+++ b/apps/server/src/application/coordinators/startGameCoordinator.ts
@@ -106,7 +106,8 @@
     gameSession: gameManager,
     bombStore: gameManager,
     onGameEnd: () => {
-      roomManager.markRoomResult(updatedRoom.roomId);
+      roomManager.deleteRoom(updatedRoom.roomId);
+      runtimeRegistry.cleanupGameManagerForRoom(updatedRoom.roomId);
     },
     output,
   });
diff --git a/apps/server/src/domains/room/RoomManager.ts b/apps/server/src/domains/room/RoomManager.ts
index bacbff0..67b532c 100644
--- a/apps/server/src/domains/room/RoomManager.ts
+++ b/apps/server/src/domains/room/RoomManager.ts
@@ -58,13 +58,13 @@
     return this.roomPhaseService.markRoomPlaying(roomId);
   }
 
-  // ルーム状態をRESULTへ更新する
-  public markRoomResult(roomId: string): RoomPhaseTransitionResult {
-    return this.roomPhaseService.markRoomResult(roomId);
-  }
-
   // ルーム状態をWAITINGへ更新する
   public markRoomWaiting(roomId: string): RoomPhaseTransitionResult {
     return this.roomPhaseService.markRoomWaiting(roomId);
   }
+
+  // ルームを削除する
+  public deleteRoom(roomId: string): boolean {
+    return this.rooms.delete(roomId);
+  }
 }
\ No newline at end of file
diff --git a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
index 14d52ce..e0cbd1e 100644
--- a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
+++ b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
@@ -64,7 +64,6 @@
 /** ゲーム開始調停で利用するルーム状態遷移ポート */
 export interface RoomPhaseTransitionPort {
   markRoomPlaying(roomId: string): RoomPhaseTransitionResult;
-  markRoomResult(roomId: string): RoomPhaseTransitionResult;
   markRoomWaiting(roomId: string): RoomPhaseTransitionResult;
 }
 
@@ -79,6 +78,11 @@
   getRoomById(roomId: string): domain.room.Room | undefined;
 }
 
+/** ゲーム終了時にルームを削除する操作ポート */
+export interface DeleteRoomPort {
+  deleteRoom(roomId: string): boolean;
+}
+
 /** ルーム参加後にゲームランタイムを確保する操作ポート */
 export interface EnsureGameRuntimePort {
   ensureGameManagerForRoom(roomId: string): void;
diff --git a/apps/server/src/domains/room/application/services/RoomPhaseService.ts b/apps/server/src/domains/room/application/services/RoomPhaseService.ts
index f28de2f..3ee0466 100644
--- a/apps/server/src/domains/room/application/services/RoomPhaseService.ts
+++ b/apps/server/src/domains/room/application/services/RoomPhaseService.ts
@@ -29,26 +29,6 @@
     };
   }
 
-  public markRoomResult(roomId: string): RoomPhaseTransitionResult {
-    const room = this.rooms.get(roomId);
-    if (!room) {
-      return { status: "not_found" };
-    }
-
-    if (room.status !== domain.room.RoomPhase.PLAYING) {
-      return {
-        status: "invalid_transition",
-        room,
-      };
-    }
-
-    room.status = domain.room.RoomPhase.RESULT;
-    return {
-      status: "updated",
-      room,
-    };
-  }
-
   public markRoomWaiting(roomId: string): RoomPhaseTransitionResult {
     const room = this.rooms.get(roomId);
     if (!room) {
diff --git a/apps/server/src/network/types/connectionPorts.ts b/apps/server/src/network/types/connectionPorts.ts
index c96e091..b025c7b 100644
--- a/apps/server/src/network/types/connectionPorts.ts
+++ b/apps/server/src/network/types/connectionPorts.ts
@@ -35,7 +35,7 @@
 /** ゲームイベント調停で利用するルーム依存ポート */
 export type GameEventRoomUseCasePort = Pick<
   ConnectionRoomPort,
-  "getRoomByOwnerId" | "getRoomByPlayerId" | "markRoomPlaying" | "markRoomResult" | "markRoomWaiting"
+  "getRoomByOwnerId" | "getRoomByPlayerId" | "markRoomPlaying" | "markRoomWaiting"
 >;
 
 /** ゲームイベント調停で利用するランタイム依存ポート */