diff --git a/apps/server/src/network/SocketManager.ts b/apps/server/src/network/SocketManager.ts
new file mode 100644
index 0000000..0811091
--- /dev/null
+++ b/apps/server/src/network/SocketManager.ts
@@ -0,0 +1,47 @@
+// src/network/SocketManager.ts
+import { Server, Socket } from "socket.io";
+import { GameManager } from "../managers/GameManager.js";
+
+export class SocketManager {
+  private io: Server;
+  private gameManager: GameManager;
+
+  constructor(io: Server, gameManager: GameManager) {
+    this.io = io;
+    this.gameManager = gameManager;
+  }
+
+  public initialize() {
+    this.io.on("connection", (socket: Socket) => {
+      console.log(`✅ User connected: ${socket.id}`);
+
+      // 1. ゲームにプレイヤーを追加
+      const player = this.gameManager.addPlayer(socket.id);
+
+      // 2. 参加した本人に「現在の全プレイヤー」を教える
+      socket.emit("current_players", this.gameManager.getAllPlayers());
+
+      // 3. 他のみんなに「新しい人が来たよ」と教える
+      socket.broadcast.emit("new_player", player);
+
+      // --- イベント受信 ---
+
+      // 移動データが来た時
+      socket.on("move", (data: { x: number; y: number }) => {
+        // マネージャーの状態を更新
+        this.gameManager.movePlayer(socket.id, data.x, data.y);
+        
+        // 全員に位置情報を配信
+        // (人数が増えたらここを最適化しますが、まずはこれでOK)
+        this.io.emit("update_player", { id: socket.id, x: data.x, y: data.y });
+      });
+
+      // 切断した時
+      socket.on("disconnect", () => {
+        console.log(`❌ User disconnected: ${socket.id}`);
+        this.gameManager.removePlayer(socket.id);
+        this.io.emit("remove_player", socket.id);
+      });
+    });
+  }
+}
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