diff --git a/apps/server/src/application/coordinators/startGameCoordinator.ts b/apps/server/src/application/coordinators/startGameCoordinator.ts
index 766b626..57e5cd1 100644
--- a/apps/server/src/application/coordinators/startGameCoordinator.ts
+++ b/apps/server/src/application/coordinators/startGameCoordinator.ts
@@ -6,8 +6,11 @@
   type BombCleanupPort,
   type GameOutputPort,
   type StartGamePort,
-  type StartGameRoomPort,
 } from "@server/domains/game/application/ports/gameUseCasePorts";
+import type {
+  FindRoomByOwnerPort,
+  RoomPhaseTransitionPort,
+} from "@server/domains/room/application/ports/roomUseCasePorts";
 import { startGameUseCase } from "@server/domains/game/application/useCases/startGameUseCase";
 import { logEvent } from "@server/logging/logger";
 import { gameUseCaseLogEvents, logResults, logScopes } from "@server/logging/index";
@@ -16,7 +19,7 @@
 type StartGameCoordinatorParams = {
   ownerId: string;
   gameManager: StartGamePort & BombCleanupPort;
-  roomManager: StartGameRoomPort;
+  roomManager: FindRoomByOwnerPort & RoomPhaseTransitionPort;
   output: Pick<
     GameOutputPort,
     | "publishUpdatePlayersToRoom"
diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 249545b..7b21bed 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -29,13 +29,6 @@
   getRoomStartTime(roomId: string): number | undefined;
 }
 
-/** ゲーム開始調停で利用するルーム管理入力ポート */
-export interface StartGameRoomPort {
-  getRoomByOwnerId(ownerId: string): roomTypes.Room | undefined;
-  markRoomPlaying(roomId: string): roomTypes.Room | undefined;
-  markRoomWaiting(roomId: string): roomTypes.Room | undefined;
-}
-
 /** 準備完了ユースケースが利用するゲーム状態参照入力ポート */
 export interface ReadyForGamePort {
   getRoomPlayers(roomId: string): playerTypes.PlayerData[];
diff --git a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
index 9845676..b32c711 100644
--- a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
+++ b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
@@ -31,6 +31,17 @@
   getRoomByPlayerId(playerId: string): roomTypes.Room | undefined;
 }
 
+/** ゲーム開始調停で利用するオーナー所属ルーム参照ポート */
+export interface FindRoomByOwnerPort {
+  getRoomByOwnerId(ownerId: string): roomTypes.Room | undefined;
+}
+
+/** 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): roomTypes.Room | undefined;
+  markRoomWaiting(roomId: string): roomTypes.Room | undefined;
+}
+
 /** ルームIDでの存在確認に利用する参照ポート */
 export interface FindRoomByIdPort {
   getRoomById(roomId: string): roomTypes.Room | undefined;
diff --git a/apps/server/src/network/handlers/game/registerGameHandlers.ts b/apps/server/src/network/handlers/game/registerGameHandlers.ts
index 6794b78..68b0ed9 100644
--- a/apps/server/src/network/handlers/game/registerGameHandlers.ts
+++ b/apps/server/src/network/handlers/game/registerGameHandlers.ts
@@ -6,13 +6,16 @@
 import { protocol } from "@repo/shared";
 import { readyForGameCoordinator } from "@server/application/coordinators/readyForGameCoordinator";
 import { startGameCoordinator } from "@server/application/coordinators/startGameCoordinator";
-import type { FindRoomByPlayerPort } from "@server/domains/room/application/ports/roomUseCasePorts";
+import type {
+  FindRoomByOwnerPort,
+  FindRoomByPlayerPort,
+  RoomPhaseTransitionPort,
+} from "@server/domains/room/application/ports/roomUseCasePorts";
 import type {
   BombStatePort,
   MovePlayerPort,
   ReadyForGamePort,
   StartGamePort,
-  StartGameRoomPort,
 } from "@server/domains/game/application/ports/gameUseCasePorts";
 import { movePlayerUseCase } from "@server/domains/game/application/useCases/movePlayerUseCase";
 import { placeBombUseCase } from "@server/domains/game/application/useCases/placeBombUseCase";
@@ -35,7 +38,7 @@
   io: Server,
   socket: Socket,
   gameManager: StartGamePort & ReadyForGamePort & MovePlayerPort & BombStatePort,
-  roomManager: StartGameRoomPort & FindRoomByPlayerPort
+  roomManager: FindRoomByOwnerPort & FindRoomByPlayerPort & RoomPhaseTransitionPort
 ) => {
   const common = createCommonHandlerContext(io, socket);
   const gameOutputAdapter = createGameOutputAdapter(common);
diff --git a/apps/server/src/network/types/connectionPorts.ts b/apps/server/src/network/types/connectionPorts.ts
index 10e3c85..7a1696a 100644
--- a/apps/server/src/network/types/connectionPorts.ts
+++ b/apps/server/src/network/types/connectionPorts.ts
@@ -9,13 +9,14 @@
   MovePlayerPort,
   ReadyForGamePort,
   StartGamePort,
-  StartGameRoomPort,
 } from "@server/domains/game/application/ports/gameUseCasePorts";
 import type {
   DisconnectRoomPort,
+  FindRoomByOwnerPort,
   FindRoomByIdPort,
   FindRoomByPlayerPort,
   JoinRoomPort,
+  RoomPhaseTransitionPort,
 } from "@server/domains/room/application/ports/roomUseCasePorts";
 import type { DisconnectCoordinatorParams } from "../../application/coordinators/disconnectCoordinator";
 
@@ -29,8 +30,9 @@
 /** 接続時のルーム処理で利用する入力ポート集合 */
 export type ConnectionRoomPort =
   & JoinRoomPort
-  & StartGameRoomPort
-  & FindRoomByPlayerPort;
+  & FindRoomByOwnerPort
+  & FindRoomByPlayerPort
+  & RoomPhaseTransitionPort;
 
 /** ソケット接続全体で利用するゲーム管理ポート集合 */
 export type SocketConnectionGamePort =
@@ -41,8 +43,7 @@
 export type SocketConnectionRoomPort =
   & ConnectionRoomPort
   & DisconnectRoomPort
-  & FindRoomByIdPort
-  & FindRoomByPlayerPort;
+  & FindRoomByIdPort;
 
 /** ソケット接続ハンドラで受け取るマネージャ依存の束 */
 export type SocketConnectionManagerBundle = {
@@ -51,10 +52,13 @@
 };
 
 /** 切断時のゲーム処理で利用する入力ポート */
-export type DisconnectGamePort = DisconnectPlayerPort;
+export type DisconnectGamePort = Pick<SocketConnectionGamePort, "removePlayer">;
 
 /** 切断時のルーム処理で利用する入力ポート集合 */
-export type DisconnectRoomHandlerPort = DisconnectRoomPort & FindRoomByPlayerPort & FindRoomByIdPort;
+export type DisconnectRoomHandlerPort = Pick<
+  SocketConnectionRoomPort,
+  "removePlayer" | "getRoomByPlayerId" | "getRoomById"
+>;
 
 /** 切断調停処理へ受け渡す依存集合 */
 export type DisconnectCoordinatorPortBundle = Omit<DisconnectCoordinatorParams, "socketId">;