diff --git a/apps/client/src/network/SocketClient.ts b/apps/client/src/network/SocketClient.ts
index f2b204d..c2702a2 100644
--- a/apps/client/src/network/SocketClient.ts
+++ b/apps/client/src/network/SocketClient.ts
@@ -16,7 +16,7 @@
       : config.NETWORK_CONFIG.DEV_SERVER_URL;
 
     this.socket = io(SERVER_URL, {
-      transports: ["websocket", "polling"], // 接続の安定性を高める
+      transports: [...config.NETWORK_CONFIG.SOCKET_TRANSPORTS], // 接続の安定性を高める
       withCredentials: true
     });
   }
diff --git a/apps/client/vite.config.ts b/apps/client/vite.config.ts
index 1d5ea78..04fb3d8 100644
--- a/apps/client/vite.config.ts
+++ b/apps/client/vite.config.ts
@@ -4,6 +4,7 @@
 
 export default defineConfig(({ mode }) => {
   const isProd = mode === 'production'
+  const socketPath = config.NETWORK_CONFIG.SOCKET_IO_PATH
 
   return {
     plugins: [react()],
@@ -11,7 +12,7 @@
       ? undefined
       : {
           proxy: {
-            '/socket.io': {
+            [socketPath]: {
               target: config.NETWORK_CONFIG.DEV_SERVER_URL,
               ws: true,
             },
diff --git a/apps/server/src/index.ts b/apps/server/src/index.ts
index 13b74f4..adb84a4 100644
--- a/apps/server/src/index.ts
+++ b/apps/server/src/index.ts
@@ -3,17 +3,18 @@
 import { GameManager } from "./domains/game/GameManager";
 import { RoomManager } from "./domains/room/RoomManager";
 import { SocketManager } from "./network/SocketManager";
+import { config } from "@repo/shared";
 
 // サーバー待受ポート
-const PORT = process.env.PORT || 3000;
+const PORT = process.env.PORT || config.NETWORK_CONFIG.DEV_SERVER_PORT;
 
 // HTTP サーバー・Socket.io サーバー生成
 const httpServer = createServer();
 const io = new Server(httpServer, {
   cors: {
     // 開発環境向け全オリジン許可設定
-    origin: "*",
-    methods: ["GET", "POST"]
+    origin: config.NETWORK_CONFIG.CORS_ORIGIN,
+    methods: [...config.NETWORK_CONFIG.CORS_METHODS]
   },
 });
 
diff --git "a/docs/01_Env/ENV_01_\347\222\260\345\242\203\346\247\213\347\257\211\343\203\273\346\212\200\350\241\223\343\202\271\343\202\277\343\203\203\343\202\257.txt" "b/docs/01_Env/ENV_01_\347\222\260\345\242\203\346\247\213\347\257\211\343\203\273\346\212\200\350\241\223\343\202\271\343\202\277\343\203\203\343\202\257.txt"
index af04675..6bcbec5 100644
--- "a/docs/01_Env/ENV_01_\347\222\260\345\242\203\346\247\213\347\257\211\343\203\273\346\212\200\350\241\223\343\202\271\343\202\277\343\203\203\343\202\257.txt"
+++ "b/docs/01_Env/ENV_01_\347\222\260\345\242\203\346\247\213\347\257\211\343\203\273\346\212\200\350\241\223\343\202\271\343\202\277\343\203\203\343\202\257.txt"
@@ -106,7 +106,9 @@
     │       └── src/
     │           ├── index.ts                                # 共有エクスポート
     │           ├── config/
+    │           │   ├── index.ts                            # 設定エクスポート
     │           │   └── gameConfig.ts                       # 共通定数
+    │           │   └── networkConfig.ts                    # 通信設定
     │           ├── domains/
     │           │   ├── gridMap/
     │           │   │   ├── gridMap.logic.ts                # マップ計算
diff --git a/packages/shared/src/config/networkConfig.ts b/packages/shared/src/config/networkConfig.ts
index 5b6a960..88220b5 100644
--- a/packages/shared/src/config/networkConfig.ts
+++ b/packages/shared/src/config/networkConfig.ts
@@ -1,4 +1,10 @@
 export const NETWORK_CONFIG = {
-  DEV_SERVER_URL: "http://localhost:3000",
+  DEV_SERVER_HOST: "http://localhost",
+  DEV_SERVER_PORT: 3000,
+  get DEV_SERVER_URL() { return `${this.DEV_SERVER_HOST}:${this.DEV_SERVER_PORT}`; },
   PROD_SERVER_URL: "https://skillsemiwebgame.onrender.com",
+  SOCKET_TRANSPORTS: ["websocket", "polling"],
+  CORS_ORIGIN: "*",
+  CORS_METHODS: ["GET", "POST"],
+  SOCKET_IO_PATH: "/socket.io",
 } as const;