diff --git a/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts b/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
index cad9dfe..1db69d0 100644
--- a/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
@@ -3,17 +3,17 @@
 
 type EmitToAll = (event: string, payload?: unknown) => void;
 
-type ExecuteDisconnectUseCaseParams = {
+type DisconnectUseCaseParams = {
   gameManager: DisconnectPlayerPort;
   playerId: string;
   emitToAll: EmitToAll;
 };
 
-export const executeDisconnectUseCase = ({
+export const disconnectUseCase = ({
   gameManager,
   playerId,
   emitToAll,
-}: ExecuteDisconnectUseCaseParams) => {
+}: DisconnectUseCaseParams) => {
   gameManager.removePlayer(playerId);
   emitToAll(protocol.SocketEvents.REMOVE_PLAYER, playerId);
   console.log("[GameHandler] player removed", { playerId });
diff --git a/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts b/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
index 3034194..9bcece1 100644
--- a/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
@@ -1,16 +1,16 @@
 import type { playerTypes } from "@repo/shared";
 import type { MovePlayerPort } from "../ports/gameUseCasePorts";
 
-type ExecuteMovePlayerUseCaseParams = {
+type MovePlayerUseCaseParams = {
   gameManager: MovePlayerPort;
   playerId: string;
   move: playerTypes.MovePayload;
 };
 
-export const executeMovePlayerUseCase = ({
+export const movePlayerUseCase = ({
   gameManager,
   playerId,
   move,
-}: ExecuteMovePlayerUseCaseParams) => {
+}: MovePlayerUseCaseParams) => {
   gameManager.movePlayer(playerId, move.x, move.y);
 };
diff --git a/apps/server/src/domains/game/application/useCases/executePingUseCase.ts b/apps/server/src/domains/game/application/useCases/executePingUseCase.ts
index 59b1e44..0ef9f54 100644
--- a/apps/server/src/domains/game/application/useCases/executePingUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executePingUseCase.ts
@@ -2,15 +2,15 @@
 
 type EmitToSocket = (event: string, payload?: unknown) => void;
 
-type ExecutePingUseCaseParams = {
+type PingUseCaseParams = {
   clientTime: number;
   emitToSocket: EmitToSocket;
 };
 
-export const executePingUseCase = ({
+export const pingUseCase = ({
   clientTime,
   emitToSocket,
-}: ExecutePingUseCaseParams) => {
+}: PingUseCaseParams) => {
   emitToSocket(protocol.SocketEvents.PONG, {
     clientTime,
     serverTime: Date.now(),
diff --git a/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts b/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
index 75aec11..92ab796 100644
--- a/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
@@ -3,19 +3,19 @@
 
 type EmitToSocket = (event: string, payload?: unknown) => void;
 
-type ExecuteReadyForGameUseCaseParams = {
+type ReadyForGameUseCaseParams = {
   socketId: string;
   roomId?: string;
   gameManager: ReadyForGamePort;
   emitToSocket: EmitToSocket;
 };
 
-export const executeReadyForGameUseCase = ({
+export const readyForGameUseCase = ({
   socketId,
   roomId,
   gameManager,
   emitToSocket,
-}: ExecuteReadyForGameUseCaseParams) => {
+}: ReadyForGameUseCaseParams) => {
   const allPlayers = gameManager.getAllPlayers();
   emitToSocket(protocol.SocketEvents.CURRENT_PLAYERS, allPlayers);
 
diff --git a/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts b/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
index 2c9a8e3..41b2772 100644
--- a/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
@@ -4,19 +4,19 @@
 
 type EmitToRoom = (roomId: string, event: string, payload?: unknown) => void;
 
-type ExecuteStartGameUseCaseParams = {
+type StartGameUseCaseParams = {
   ownerId: string;
   gameManager: StartGamePort;
   roomManager: RoomManager;
   emitToRoom: EmitToRoom;
 };
 
-export const executeStartGameUseCase = ({
+export const startGameUseCase = ({
   ownerId,
   gameManager,
   roomManager,
   emitToRoom,
-}: ExecuteStartGameUseCaseParams) => {
+}: StartGameUseCaseParams) => {
   const room = roomManager.getRoomByOwnerId(ownerId);
   if (!room) {
     console.log("[GameHandler] START_GAME ignored (no room)", { socketId: ownerId });
diff --git a/apps/server/src/domains/game/handlers/onDisconnect.ts b/apps/server/src/domains/game/handlers/onDisconnect.ts
index 94ee5f0..d5856af 100644
--- a/apps/server/src/domains/game/handlers/onDisconnect.ts
+++ b/apps/server/src/domains/game/handlers/onDisconnect.ts
@@ -1,13 +1,13 @@
 import { Server } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
-import { executeDisconnectUseCase } from "@server/domains/game/application/useCases/executeDisconnectUseCase";
+import { disconnectUseCase } from "@server/domains/game/application/useCases/executeDisconnectUseCase";
 
 export const onDisconnect = (
   io: Server,
   gameManager: GameManager,
   playerId: string
 ) => {
-  executeDisconnectUseCase({
+  disconnectUseCase({
     gameManager,
     playerId,
     emitToAll: (event, payload) => {
diff --git a/apps/server/src/domains/game/handlers/onMove.ts b/apps/server/src/domains/game/handlers/onMove.ts
index 2b5ceb5..32383df 100644
--- a/apps/server/src/domains/game/handlers/onMove.ts
+++ b/apps/server/src/domains/game/handlers/onMove.ts
@@ -1,13 +1,13 @@
 import { GameManager } from "@server/domains/game/GameManager";
 import type { playerTypes } from "@repo/shared";
-import { executeMovePlayerUseCase } from "@server/domains/game/application/useCases/executeMovePlayerUseCase";
+import { movePlayerUseCase } from "@server/domains/game/application/useCases/executeMovePlayerUseCase";
 
 export const onMove = (
   gameManager: GameManager,
   playerId: string,
   data: playerTypes.MovePayload
 ) => {
-  executeMovePlayerUseCase({
+  movePlayerUseCase({
     gameManager,
     playerId,
     move: data,
diff --git a/apps/server/src/domains/game/handlers/onPing.ts b/apps/server/src/domains/game/handlers/onPing.ts
index a4ddf1c..8cc8ac0 100644
--- a/apps/server/src/domains/game/handlers/onPing.ts
+++ b/apps/server/src/domains/game/handlers/onPing.ts
@@ -1,8 +1,8 @@
 import { Socket } from "socket.io";
-import { executePingUseCase } from "@server/domains/game/application/useCases/executePingUseCase";
+import { pingUseCase } from "@server/domains/game/application/useCases/executePingUseCase";
 
 export const onPing = (socket: Socket, clientTime: number) => {
-  executePingUseCase({
+  pingUseCase({
     clientTime,
     emitToSocket: (event, payload) => {
       if (payload === undefined) {
diff --git a/apps/server/src/domains/game/handlers/onReadyForGame.ts b/apps/server/src/domains/game/handlers/onReadyForGame.ts
index c708f1b..06d8897 100644
--- a/apps/server/src/domains/game/handlers/onReadyForGame.ts
+++ b/apps/server/src/domains/game/handlers/onReadyForGame.ts
@@ -1,6 +1,6 @@
 import { Socket } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
-import { executeReadyForGameUseCase } from "@server/domains/game/application/useCases/executeReadyForGameUseCase";
+import { readyForGameUseCase } from "@server/domains/game/application/useCases/executeReadyForGameUseCase";
 
 export const onReadyForGame = (
   socket: Socket,
@@ -8,7 +8,7 @@
 ) => {
   const roomId = Array.from(socket.rooms).find((room) => room !== socket.id);
 
-  executeReadyForGameUseCase({
+  readyForGameUseCase({
     socketId: socket.id,
     roomId,
     gameManager,
diff --git a/apps/server/src/domains/game/handlers/onStartGame.ts b/apps/server/src/domains/game/handlers/onStartGame.ts
index 3b759f3..8fa6df6 100644
--- a/apps/server/src/domains/game/handlers/onStartGame.ts
+++ b/apps/server/src/domains/game/handlers/onStartGame.ts
@@ -1,7 +1,7 @@
 import { Server } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
-import { executeStartGameUseCase } from "@server/domains/game/application/useCases/executeStartGameUseCase";
+import { startGameUseCase } from "@server/domains/game/application/useCases/executeStartGameUseCase";
 
 export const onStartGame = (
   io: Server,
@@ -9,7 +9,7 @@
   roomManager: RoomManager,
   ownerId: string
 ) => {
-  executeStartGameUseCase({
+  startGameUseCase({
     ownerId,
     gameManager,
     roomManager,
diff --git a/apps/server/src/domains/room/RoomHandler.ts b/apps/server/src/domains/room/RoomHandler.ts
index 6cb4672..c67d521 100644
--- a/apps/server/src/domains/room/RoomHandler.ts
+++ b/apps/server/src/domains/room/RoomHandler.ts
@@ -2,8 +2,8 @@
 import { RoomManager } from "./RoomManager";
 import { protocol } from "@repo/shared";
 import type { roomTypes } from "@repo/shared";
-import { executeJoinRoomUseCase } from "./application/useCases/executeJoinRoomUseCase";
-import { executeRoomDisconnectUseCase } from "./application/useCases/executeRoomDisconnectUseCase";
+import { joinRoomUseCase } from "./application/useCases/executeJoinRoomUseCase";
+import { roomDisconnectUseCase } from "./application/useCases/executeRoomDisconnectUseCase";
 
 export const registerRoomHandlers = (io: Server, socket: Socket, roomManager: RoomManager) => {
   
@@ -12,7 +12,7 @@
     
     socket.join(roomId);
 
-    executeJoinRoomUseCase({
+    joinRoomUseCase({
       roomManager,
       socketId: socket.id,
       data,
@@ -33,7 +33,7 @@
  * 切断時のルームクリーンアップ処理
  */
 export const handleRoomDisconnect = (io: Server, socket: Socket, roomManager: RoomManager) => {
-  executeRoomDisconnectUseCase({
+  roomDisconnectUseCase({
     roomManager,
     socketId: socket.id,
     emitToRoom: (roomId, event, payload) => {
diff --git a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
new file mode 100644
index 0000000..37d7416
--- /dev/null
+++ b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
@@ -0,0 +1,9 @@
+import type { roomTypes } from "@repo/shared";
+
+export interface JoinRoomPort {
+  addPlayerToRoom(roomId: string, socketId: string, playerName: string): roomTypes.Room;
+}
+
+export interface DisconnectRoomPort {
+  removePlayer(socketId: string): roomTypes.Room[];
+}
diff --git a/apps/server/src/domains/room/application/useCases/executeJoinRoomUseCase.ts b/apps/server/src/domains/room/application/useCases/executeJoinRoomUseCase.ts
index 284f07b..2123b35 100644
--- a/apps/server/src/domains/room/application/useCases/executeJoinRoomUseCase.ts
+++ b/apps/server/src/domains/room/application/useCases/executeJoinRoomUseCase.ts
@@ -1,22 +1,22 @@
 import { protocol } from "@repo/shared";
 import type { roomTypes } from "@repo/shared";
-import { RoomManager } from "@server/domains/room/RoomManager";
+import type { JoinRoomPort } from "../ports/roomUseCasePorts";
 
 type EmitToRoom = (roomId: string, event: string, payload?: unknown) => void;
 
-type ExecuteJoinRoomUseCaseParams = {
-  roomManager: RoomManager;
+type JoinRoomUseCaseParams = {
+  roomManager: JoinRoomPort;
   socketId: string;
   data: roomTypes.JoinRoomPayload;
   emitToRoom: EmitToRoom;
 };
 
-export const executeJoinRoomUseCase = ({
+export const joinRoomUseCase = ({
   roomManager,
   socketId,
   data,
   emitToRoom,
-}: ExecuteJoinRoomUseCaseParams) => {
+}: JoinRoomUseCaseParams) => {
   const { roomId, playerName } = data;
   console.log("[RoomHandler] JOIN_ROOM received", { roomId, socketId, playerName });
 
diff --git a/apps/server/src/domains/room/application/useCases/executeRoomDisconnectUseCase.ts b/apps/server/src/domains/room/application/useCases/executeRoomDisconnectUseCase.ts
index 1b05af1..be33326 100644
--- a/apps/server/src/domains/room/application/useCases/executeRoomDisconnectUseCase.ts
+++ b/apps/server/src/domains/room/application/useCases/executeRoomDisconnectUseCase.ts
@@ -1,19 +1,19 @@
 import { protocol } from "@repo/shared";
-import { RoomManager } from "@server/domains/room/RoomManager";
+import type { DisconnectRoomPort } from "../ports/roomUseCasePorts";
 
 type EmitToRoom = (roomId: string, event: string, payload?: unknown) => void;
 
-type ExecuteRoomDisconnectUseCaseParams = {
-  roomManager: RoomManager;
+type RoomDisconnectUseCaseParams = {
+  roomManager: DisconnectRoomPort;
   socketId: string;
   emitToRoom: EmitToRoom;
 };
 
-export const executeRoomDisconnectUseCase = ({
+export const roomDisconnectUseCase = ({
   roomManager,
   socketId,
   emitToRoom,
-}: ExecuteRoomDisconnectUseCaseParams) => {
+}: RoomDisconnectUseCaseParams) => {
   const updatedRooms = roomManager.removePlayer(socketId);
   console.log("[RoomHandler] disconnect cleanup", {
     socketId,