diff --git a/apps/server/src/network/SocketManager.ts b/apps/server/src/network/SocketManager.ts
index 71bdb3c..39372ed 100644
--- a/apps/server/src/network/SocketManager.ts
+++ b/apps/server/src/network/SocketManager.ts
@@ -1,8 +1,13 @@
+/**
+ * SocketManager
+ * Socket.IO接続ハンドラの登録を初期化するマネージャ
+ */
 import { Server } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
 import { registerConnectionHandlers } from "./handlers/registerConnectionHandlers";
 
+/** Socket.IOの接続ハンドラ登録を統括する */
 export class SocketManager {
   private io: Server;
   private gameManager: GameManager;
@@ -15,6 +20,7 @@
   }
 
   public initialize() {
+    // 接続時に必要な各ドメインハンドラを登録する
     registerConnectionHandlers({
       io: this.io,
       gameManager: this.gameManager,
diff --git a/apps/server/src/network/adapters/socketEmitters.ts b/apps/server/src/network/adapters/socketEmitters.ts
index 32439b9..4895b90 100644
--- a/apps/server/src/network/adapters/socketEmitters.ts
+++ b/apps/server/src/network/adapters/socketEmitters.ts
@@ -1,3 +1,7 @@
+/**
+ * socketEmitters
+ * Socket.IOの送信処理を用途別に生成するアダプタ
+ */
 import { Server, Socket } from "socket.io";
 
 type EmitPayload = unknown;
@@ -15,18 +19,21 @@
   emit(event, payload);
 };
 
+/** ルーム単位の送信関数を生成する */
 export const createEmitToRoom = (io: Server) => {
   return (roomId: string, event: string, payload?: EmitPayload) => {
     emitWithOptionalPayload((eventName, body) => io.to(roomId).emit(eventName, body), event, payload);
   };
 };
 
+/** 単一ソケット向けの送信関数を生成する */
 export const createEmitToSocket = (socket: Socket) => {
   return (event: string, payload?: EmitPayload) => {
     emitWithOptionalPayload((eventName, body) => socket.emit(eventName, body), event, payload);
   };
 };
 
+/** 全接続向けの送信関数を生成する */
 export const createEmitToAll = (io: Server) => {
   return (event: string, payload?: EmitPayload) => {
     emitWithOptionalPayload((eventName, body) => io.emit(eventName, body), event, payload);
diff --git a/apps/server/src/network/bootstrap/boot.ts b/apps/server/src/network/bootstrap/boot.ts
index 004c870..29ba1ff 100644
--- a/apps/server/src/network/bootstrap/boot.ts
+++ b/apps/server/src/network/bootstrap/boot.ts
@@ -1,10 +1,16 @@
+/**
+ * boot
+ * HTTPサーバにSocket.IOと各マネージャを接続して起動準備を行う
+ */
 import type { Server as HttpServer } from "http";
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
 import { SocketManager } from "../SocketManager";
 import { createIo } from "./createIo";
 
+/** 通信基盤とドメインマネージャを初期化して接続ハンドラを有効化する */
 export const boot = (httpServer: HttpServer) => {
+  // ネットワーク層とドメイン層の依存を構築する
   const io = createIo(httpServer);
   const gameManager = new GameManager();
   const roomManager = new RoomManager();
diff --git a/apps/server/src/network/bootstrap/createHttpServer.ts b/apps/server/src/network/bootstrap/createHttpServer.ts
index 3434920..f797925 100644
--- a/apps/server/src/network/bootstrap/createHttpServer.ts
+++ b/apps/server/src/network/bootstrap/createHttpServer.ts
@@ -1,13 +1,20 @@
+/**
+ * createHttpServer
+ * ヘルスチェック用途のHTTPサーバを生成する
+ */
 import { createServer } from "http";
 
+/** ルートの疎通確認と未定義パス応答を提供するHTTPサーバを生成する */
 export const createHttpServer = () => {
   return createServer((req, res) => {
+    // ヘルスチェック要求に成功応答を返す
     if (req.url === "/") {
       res.writeHead(200, { "Content-Type": "text/plain; charset=utf-8" });
       res.end("ok");
       return;
     }
 
+    // 未定義パスには404を返す
     res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
     res.end("not found");
   });
diff --git a/apps/server/src/network/bootstrap/createIo.ts b/apps/server/src/network/bootstrap/createIo.ts
index e77fb86..c492f28 100644
--- a/apps/server/src/network/bootstrap/createIo.ts
+++ b/apps/server/src/network/bootstrap/createIo.ts
@@ -1,7 +1,12 @@
+/**
+ * createIo
+ * 共有設定を用いてSocket.IOサーバを生成する
+ */
 import { Server } from "socket.io";
 import { config } from "@repo/shared";
 import type { Server as HttpServer } from "http";
 
+/** CORS設定を適用したSocket.IOサーバを生成する */
 export const createIo = (httpServer: HttpServer) => {
   return new Server(httpServer, {
     cors: {
diff --git a/apps/server/src/network/handlers/CommonHandler.ts b/apps/server/src/network/handlers/CommonHandler.ts
index ef0dc0e..cd6bb1e 100644
--- a/apps/server/src/network/handlers/CommonHandler.ts
+++ b/apps/server/src/network/handlers/CommonHandler.ts
@@ -1,3 +1,7 @@
+/**
+ * CommonHandler
+ * 各ハンドラで共有する送信関数群を組み立てる
+ */
 import { Server, Socket } from "socket.io";
 import {
   createEmitToAll,
@@ -5,12 +9,14 @@
   createEmitToSocket,
 } from "@server/network/adapters/socketEmitters";
 
+/** ハンドラで共通利用する送信コンテキスト */
 export type CommonHandlerContext = {
   emitToAll: ReturnType<typeof createEmitToAll>;
   emitToRoom: ReturnType<typeof createEmitToRoom>;
   emitToSocket: ReturnType<typeof createEmitToSocket>;
 };
 
+/** 送信先別のエミッタをまとめた共通コンテキストを生成する */
 export const createCommonHandlerContext = (
   io: Server,
   socket: Socket
diff --git a/apps/server/src/network/handlers/GameHandler.ts b/apps/server/src/network/handlers/GameHandler.ts
index c6b1ef1..3cefc15 100644
--- a/apps/server/src/network/handlers/GameHandler.ts
+++ b/apps/server/src/network/handlers/GameHandler.ts
@@ -1,2 +1,8 @@
+/**
+ * GameHandler
+ * ゲーム関連ハンドラを外部公開する再エクスポート定義
+ */
+/** ゲームイベント受信ハンドラ登録関数を再公開する */
 export { registerGameHandlers } from "./game/registerGameHandlers";
+/** ゲーム切断処理ハンドラを再公開する */
 export { handleGameDisconnect } from "./game/handleGameDisconnect";
diff --git a/apps/server/src/network/handlers/RoomHandler.ts b/apps/server/src/network/handlers/RoomHandler.ts
index dcd3d5e..4ff4894 100644
--- a/apps/server/src/network/handlers/RoomHandler.ts
+++ b/apps/server/src/network/handlers/RoomHandler.ts
@@ -1,2 +1,8 @@
+/**
+ * RoomHandler
+ * ルーム関連ハンドラを外部公開する再エクスポート定義
+ */
+/** ルームイベント受信ハンドラ登録関数を再公開する */
 export { registerRoomHandlers } from "./room/registerRoomHandlers";
+/** ルーム切断処理ハンドラを再公開する */
 export { handleRoomDisconnect } from "./room/handleRoomDisconnect";
diff --git a/apps/server/src/network/handlers/game/createGameEventPublisher.ts b/apps/server/src/network/handlers/game/createGameEventPublisher.ts
index f8db10a..c8b1927 100644
--- a/apps/server/src/network/handlers/game/createGameEventPublisher.ts
+++ b/apps/server/src/network/handlers/game/createGameEventPublisher.ts
@@ -1,3 +1,7 @@
+/**
+ * createGameEventPublisher
+ * ゲーム系ユースケースから利用する送信関数群を生成する
+ */
 import { Server } from "socket.io";
 import { protocol } from "@repo/shared";
 import type { gridMapTypes, playerTypes, roomTypes } from "@repo/shared";
@@ -12,6 +16,7 @@
 type UpdatePlayerPayload = playerTypes.PlayerData;
 type MapCellUpdatesPayload = gridMapTypes.CellUpdate[];
 
+/** ゲーム進行中イベントの送信インターフェース */
 export type GameEventPublisher = {
   publishPongToSocket: (payload: PongPayload) => void;
   publishUpdatePlayerToRoom: (roomId: RoomId, playerData: UpdatePlayerPayload) => void;
@@ -22,10 +27,12 @@
   publishGameStartToSocket: (payload: GameStartPayload) => void;
 };
 
+/** 切断時に配信するゲームイベントの送信インターフェース */
 export type GameDisconnectPublisher = {
   publishPlayerRemovedToAll: (removedPlayerId: SocketId) => void;
 };
 
+/** 共通送信コンテキストからゲームイベント送信関数群を生成する */
 export const createGameEventPublisher = (common: CommonHandlerContext): GameEventPublisher => {
   return {
     publishPongToSocket: (payload: PongPayload) => {
@@ -52,6 +59,7 @@
   };
 };
 
+/** ゲーム切断時の送信関数群を生成する */
 export const createGameDisconnectPublisher = (io: Server): GameDisconnectPublisher => {
   const emitToAll = createEmitToAll(io);
 
diff --git a/apps/server/src/network/handlers/game/handleGameDisconnect.ts b/apps/server/src/network/handlers/game/handleGameDisconnect.ts
index ca3b231..3cb2c11 100644
--- a/apps/server/src/network/handlers/game/handleGameDisconnect.ts
+++ b/apps/server/src/network/handlers/game/handleGameDisconnect.ts
@@ -1,8 +1,13 @@
+/**
+ * handleGameDisconnect
+ * ゲーム切断ユースケースを呼び出してプレイヤー離脱を配信する
+ */
 import { Server } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
 import { disconnectUseCase } from "@server/domains/game/application/useCases/disconnectUseCase";
 import { createGameDisconnectPublisher } from "./createGameEventPublisher";
 
+/** 切断したプレイヤーをゲーム管理から除外し通知する */
 export const handleGameDisconnect = (
   io: Server,
   gameManager: GameManager,
diff --git a/apps/server/src/network/handlers/game/registerGameHandlers.ts b/apps/server/src/network/handlers/game/registerGameHandlers.ts
index d457550..29d3511 100644
--- a/apps/server/src/network/handlers/game/registerGameHandlers.ts
+++ b/apps/server/src/network/handlers/game/registerGameHandlers.ts
@@ -1,3 +1,7 @@
+/**
+ * registerGameHandlers
+ * ゲーム関連イベントの受信ハンドラを登録する
+ */
 import { Server, Socket } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
@@ -12,6 +16,7 @@
 import { logEvent } from "@server/logging/logEvent";
 import { isMovePayload, isPingPayload } from "@server/network/validation/socketPayloadValidators";
 
+/** ゲームイベントの購読とユースケース呼び出しを設定する */
 export const registerGameHandlers = (
   io: Server,
   socket: Socket,
@@ -21,6 +26,7 @@
   const common = createCommonHandlerContext(io, socket);
   const gamePublisher = createGameEventPublisher(common);
 
+  // 遅延計測用のPINGを検証しPONGを返す
   socket.on(protocol.SocketEvents.PING, (clientTime: unknown) => {
     if (!isPingPayload(clientTime)) {
       logEvent("Network", {
@@ -37,6 +43,7 @@
     });
   });
 
+  // オーナー開始要求に応じてゲーム進行ユースケースを起動する
   socket.on(protocol.SocketEvents.START_GAME, () => {
     startGameUseCase({
       ownerId: socket.id,
@@ -49,6 +56,7 @@
     });
   });
 
+  // 参加者の準備完了通知を受けて現在状態を返す
   socket.on(protocol.SocketEvents.READY_FOR_GAME, () => {
     const roomId = Array.from(socket.rooms).find((room) => room !== socket.id);
 
@@ -61,6 +69,7 @@
     });
   });
 
+  // 移動入力を検証しプレイヤー移動ユースケースへ連携する
   socket.on(protocol.SocketEvents.MOVE, (data: unknown) => {
     if (!isMovePayload(data)) {
       logEvent("Network", {
diff --git a/apps/server/src/network/handlers/registerConnectionHandlers.ts b/apps/server/src/network/handlers/registerConnectionHandlers.ts
index e75f3c6..690c439 100644
--- a/apps/server/src/network/handlers/registerConnectionHandlers.ts
+++ b/apps/server/src/network/handlers/registerConnectionHandlers.ts
@@ -1,3 +1,7 @@
+/**
+ * registerConnectionHandlers
+ * 接続時にルームとゲームの各ハンドラを登録する
+ */
 import { Server, Socket } from "socket.io";
 import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
@@ -12,12 +16,14 @@
   roomManager: RoomManager;
 };
 
+/** ソケット接続と切断イベントに対する共通ハンドラを登録する */
 export const registerConnectionHandlers = ({
   io,
   gameManager,
   roomManager,
 }: RegisterConnectionHandlersParams) => {
   io.on(protocol.SocketEvents.CONNECT, (socket: Socket) => {
+    // 接続ログを記録してドメイン別ハンドラを登録する
     logEvent("Network", {
       event: "CONNECT",
       result: "connected",
@@ -28,6 +34,7 @@
     registerGameHandlers(io, socket, gameManager, roomManager);
 
     socket.on(protocol.SocketEvents.DISCONNECT, () => {
+      // 切断ログ記録後にドメイン別の後処理を実行する
       logEvent("Network", {
         event: "DISCONNECT",
         result: "disconnected",
diff --git a/apps/server/src/network/handlers/room/createRoomEventPublisher.ts b/apps/server/src/network/handlers/room/createRoomEventPublisher.ts
index 49798e7..3184664 100644
--- a/apps/server/src/network/handlers/room/createRoomEventPublisher.ts
+++ b/apps/server/src/network/handlers/room/createRoomEventPublisher.ts
@@ -1,3 +1,7 @@
+/**
+ * createRoomEventPublisher
+ * ルーム系ユースケースから利用する送信関数を生成する
+ */
 import { Server } from "socket.io";
 import { protocol } from "@repo/shared";
 import { createEmitToRoom } from "@server/network/adapters/socketEmitters";
@@ -7,10 +11,12 @@
 type RoomId = roomTypes.Room["roomId"];
 type RoomUpdatePayload = roomTypes.Room;
 
+/** ルーム更新イベントの送信インターフェース */
 export type RoomEventPublisher = {
   publishRoomUpdate: (roomId: RoomId, room: RoomUpdatePayload) => void;
 };
 
+/** 共通送信コンテキストからルームイベント送信関数を生成する */
 export const createRoomEventPublisher = (
   common: CommonHandlerContext
 ): RoomEventPublisher => {
@@ -21,6 +27,7 @@
   };
 };
 
+/** 切断時のルーム更新送信関数を生成する */
 export const createRoomDisconnectPublisher = (io: Server): RoomEventPublisher => {
   const emitToRoom = createEmitToRoom(io);
 
diff --git a/apps/server/src/network/handlers/room/handleRoomDisconnect.ts b/apps/server/src/network/handlers/room/handleRoomDisconnect.ts
index 66d9bb1..c711d20 100644
--- a/apps/server/src/network/handlers/room/handleRoomDisconnect.ts
+++ b/apps/server/src/network/handlers/room/handleRoomDisconnect.ts
@@ -1,8 +1,13 @@
+/**
+ * handleRoomDisconnect
+ * ルーム切断ユースケースを呼び出してルーム状態更新を配信する
+ */
 import { Server, Socket } from "socket.io";
 import { RoomManager } from "@server/domains/room/RoomManager";
 import { roomDisconnectUseCase } from "@server/domains/room/application/useCases/roomDisconnectUseCase";
 import { createRoomDisconnectPublisher } from "./createRoomEventPublisher";
 
+/** 切断ソケットのルーム離脱処理を実行して更新通知する */
 export const handleRoomDisconnect = (
   io: Server,
   socket: Socket,
diff --git a/apps/server/src/network/handlers/room/registerRoomHandlers.ts b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
index 2d92107..0c3dd03 100644
--- a/apps/server/src/network/handlers/room/registerRoomHandlers.ts
+++ b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
@@ -1,3 +1,7 @@
+/**
+ * registerRoomHandlers
+ * ルーム参加イベントの受信ハンドラを登録する
+ */
 import { Server, Socket } from "socket.io";
 import { RoomManager } from "@server/domains/room/RoomManager";
 import { protocol } from "@repo/shared";
@@ -8,6 +12,7 @@
 import { isJoinRoomPayload } from "@server/network/validation/socketPayloadValidators";
 import { logEvent } from "@server/logging/logEvent";
 
+/** ルーム参加イベントを検証して参加ユースケースへ連携する */
 export const registerRoomHandlers = (
   io: Server,
   socket: Socket,
@@ -16,6 +21,7 @@
   const common = createCommonHandlerContext(io, socket);
   const roomPublisher = createRoomEventPublisher(common);
 
+  // 参加要求のペイロード検証と参加処理を実行する
   socket.on(protocol.SocketEvents.JOIN_ROOM, (data: unknown) => {
     if (!isJoinRoomPayload(data)) {
       logEvent("Network", {
diff --git a/apps/server/src/network/validation/socketPayloadValidators.ts b/apps/server/src/network/validation/socketPayloadValidators.ts
index fffc822..beba0ee 100644
--- a/apps/server/src/network/validation/socketPayloadValidators.ts
+++ b/apps/server/src/network/validation/socketPayloadValidators.ts
@@ -1,3 +1,7 @@
+/**
+ * socketPayloadValidators
+ * ソケット受信ペイロードの型ガードを提供する
+ */
 import type { playerTypes, roomTypes } from "@repo/shared";
 
 const isFiniteNumber = (value: unknown): value is number => {
@@ -8,10 +12,12 @@
   return typeof value === "string" && value.trim().length > 0;
 };
 
+/** PINGイベントのペイロードが数値であるか判定する */
 export const isPingPayload = (value: unknown): value is number => {
   return isFiniteNumber(value);
 };
 
+/** MOVEイベントのペイロードが移動座標であるか判定する */
 export const isMovePayload = (value: unknown): value is playerTypes.MovePayload => {
   if (typeof value !== "object" || value === null) {
     return false;
@@ -21,6 +27,7 @@
   return isFiniteNumber(candidate.x) && isFiniteNumber(candidate.y);
 };
 
+/** JOIN_ROOMイベントのペイロードが参加情報であるか判定する */
 export const isJoinRoomPayload = (value: unknown): value is roomTypes.JoinRoomPayload => {
   if (typeof value !== "object" || value === null) {
     return false;