diff --git a/apps/client/src/scenes/game/application/GameLoop.ts b/apps/client/src/scenes/game/application/GameLoop.ts
index 77e5fd1..f9145b5 100644
--- a/apps/client/src/scenes/game/application/GameLoop.ts
+++ b/apps/client/src/scenes/game/application/GameLoop.ts
@@ -1,8 +1,9 @@
 import { Application, Container, Ticker } from "pixi.js";
-import { config } from "@repo/shared";
-import { socketManager } from "@client/network/SocketManager";
-import { LocalPlayerController, RemotePlayerController } from "../entities/player/PlayerController";
+import { LocalPlayerController } from "../entities/player/PlayerController";
 import type { GamePlayers } from "./game.types";
+import { InputStep } from "./loopSteps/InputStep";
+import { SimulationStep } from "./loopSteps/SimulationStep";
+import { CameraStep } from "./loopSteps/CameraStep";
 
 type GameLoopOptions = {
   app: Application;
@@ -17,16 +18,18 @@
   private worldContainer: Container;
   private players: GamePlayers;
   private myId: string;
-  private getJoystickInput: () => { x: number; y: number };
-  private lastPositionSentTime = 0;
-  private wasMoving = false;
+  private inputStep: InputStep;
+  private simulationStep: SimulationStep;
+  private cameraStep: CameraStep;
 
   constructor({ app, worldContainer, players, myId, getJoystickInput }: GameLoopOptions) {
     this.app = app;
     this.worldContainer = worldContainer;
     this.players = players;
     this.myId = myId;
-    this.getJoystickInput = getJoystickInput;
+    this.inputStep = new InputStep({ getJoystickInput });
+    this.simulationStep = new SimulationStep();
+    this.cameraStep = new CameraStep();
   }
 
   public tick = (ticker: Ticker) => {
@@ -34,36 +37,19 @@
     if (!me || !(me instanceof LocalPlayerController)) return;
 
     const deltaSeconds = ticker.deltaMS / 1000;
+    const { isMoving } = this.inputStep.run({ me, deltaSeconds });
 
-    const { x: dx, y: dy } = this.getJoystickInput();
-    const isMoving = dx !== 0 || dy !== 0;
-
-    if (isMoving) {
-      me.applyLocalInput({ axisX: dx, axisY: dy, deltaTime: deltaSeconds });
-      me.tick();
-
-      const now = performance.now();
-      if (now - this.lastPositionSentTime >= config.GAME_CONFIG.PLAYER_POSITION_UPDATE_MS) {
-        const position = me.getPosition();
-        socketManager.game.sendMove(position.x, position.y);
-        this.lastPositionSentTime = now;
-      }
-    } else if (this.wasMoving) {
-      me.tick();
-      const position = me.getPosition();
-      socketManager.game.sendMove(position.x, position.y);
-    } else {
-      me.tick();
-    }
-    this.wasMoving = isMoving;
-
-    Object.values(this.players).forEach((player) => {
-      if (player instanceof RemotePlayerController) {
-        player.tick(deltaSeconds);
-      }
+    this.simulationStep.run({
+      me,
+      players: this.players,
+      deltaSeconds,
+      isMoving,
     });
 
-    const meDisplay = me.getDisplayObject();
-    this.worldContainer.position.set(-(meDisplay.x - this.app.screen.width / 2), -(meDisplay.y - this.app.screen.height / 2));
+    this.cameraStep.run({
+      app: this.app,
+      worldContainer: this.worldContainer,
+      me,
+    });
   };
 }
diff --git a/apps/client/src/scenes/game/application/loopSteps/CameraStep.ts b/apps/client/src/scenes/game/application/loopSteps/CameraStep.ts
new file mode 100644
index 0000000..4871923
--- /dev/null
+++ b/apps/client/src/scenes/game/application/loopSteps/CameraStep.ts
@@ -0,0 +1,15 @@
+import { Application, Container } from "pixi.js";
+import { LocalPlayerController } from "../../entities/player/PlayerController";
+
+type CameraStepParams = {
+  app: Application;
+  worldContainer: Container;
+  me: LocalPlayerController;
+};
+
+export class CameraStep {
+  public run({ app, worldContainer, me }: CameraStepParams) {
+    const meDisplay = me.getDisplayObject();
+    worldContainer.position.set(-(meDisplay.x - app.screen.width / 2), -(meDisplay.y - app.screen.height / 2));
+  }
+}
\ No newline at end of file
diff --git a/apps/client/src/scenes/game/application/loopSteps/InputStep.ts b/apps/client/src/scenes/game/application/loopSteps/InputStep.ts
new file mode 100644
index 0000000..6ca5551
--- /dev/null
+++ b/apps/client/src/scenes/game/application/loopSteps/InputStep.ts
@@ -0,0 +1,33 @@
+import { LocalPlayerController } from "../../entities/player/PlayerController";
+
+type InputStepOptions = {
+  getJoystickInput: () => { x: number; y: number };
+};
+
+type InputStepParams = {
+  me: LocalPlayerController;
+  deltaSeconds: number;
+};
+
+type InputStepResult = {
+  isMoving: boolean;
+};
+
+export class InputStep {
+  private getJoystickInput: () => { x: number; y: number };
+
+  constructor({ getJoystickInput }: InputStepOptions) {
+    this.getJoystickInput = getJoystickInput;
+  }
+
+  public run({ me, deltaSeconds }: InputStepParams): InputStepResult {
+    const { x: axisX, y: axisY } = this.getJoystickInput();
+    const isMoving = axisX !== 0 || axisY !== 0;
+
+    if (isMoving) {
+      me.applyLocalInput({ axisX, axisY, deltaTime: deltaSeconds });
+    }
+
+    return { isMoving };
+  }
+}
\ No newline at end of file
diff --git a/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts b/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts
new file mode 100644
index 0000000..adcdc27
--- /dev/null
+++ b/apps/client/src/scenes/game/application/loopSteps/SimulationStep.ts
@@ -0,0 +1,43 @@
+import { config } from "@repo/shared";
+import { socketManager } from "@client/network/SocketManager";
+import { LocalPlayerController, RemotePlayerController } from "../../entities/player/PlayerController";
+import type { GamePlayers } from "../game.types";
+
+type SimulationStepParams = {
+  me: LocalPlayerController;
+  players: GamePlayers;
+  deltaSeconds: number;
+  isMoving: boolean;
+};
+
+export class SimulationStep {
+  private lastPositionSentTime = 0;
+  private wasMoving = false;
+
+  public run({ me, players, deltaSeconds, isMoving }: SimulationStepParams) {
+    if (isMoving) {
+      me.tick();
+
+      const now = performance.now();
+      if (now - this.lastPositionSentTime >= config.GAME_CONFIG.PLAYER_POSITION_UPDATE_MS) {
+        const position = me.getPosition();
+        socketManager.game.sendMove(position.x, position.y);
+        this.lastPositionSentTime = now;
+      }
+    } else if (this.wasMoving) {
+      me.tick();
+      const position = me.getPosition();
+      socketManager.game.sendMove(position.x, position.y);
+    } else {
+      me.tick();
+    }
+
+    this.wasMoving = isMoving;
+
+    Object.values(players).forEach((player) => {
+      if (player instanceof RemotePlayerController) {
+        player.tick(deltaSeconds);
+      }
+    });
+  }
+}
\ No newline at end of file
diff --git a/apps/client/src/scenes/game/hooks/useGameSceneController.ts b/apps/client/src/scenes/game/hooks/useGameSceneController.ts
index 62eb640..a688a92 100644
--- a/apps/client/src/scenes/game/hooks/useGameSceneController.ts
+++ b/apps/client/src/scenes/game/hooks/useGameSceneController.ts
@@ -29,8 +29,9 @@
     });
 
     const timerInterval = setInterval(() => {
-      setTimeLeft(formatRemainingTime(manager.getRemainingTime()));
-    }, 100);
+      const nextDisplay = formatRemainingTime(manager.getRemainingTime());
+      setTimeLeft((prev) => (prev === nextDisplay ? prev : nextDisplay));
+    }, config.GAME_CONFIG.TIMER_DISPLAY_UPDATE_MS);
 
     return () => {
       manager.destroy();
diff --git a/packages/shared/src/config/gameConfig.ts b/packages/shared/src/config/gameConfig.ts
index ada6e0b..32b91e2 100644
--- a/packages/shared/src/config/gameConfig.ts
+++ b/packages/shared/src/config/gameConfig.ts
@@ -3,6 +3,9 @@
   MAX_PLAYERS_PER_ROOM: 4,  // ルーム収容人数設定
   GAME_DURATION_SEC: 180, // 1ゲームの制限時間（3分 = 180秒）
 
+  // UI表示更新設定
+  TIMER_DISPLAY_UPDATE_MS: 250, // 残り時間表示の更新間隔（ms）
+
   // ネットワーク・描画補間設定
   PLAYER_POSITION_UPDATE_MS: 50,  // 座標送信間隔（20Hz）
   PLAYER_LERP_SMOOTHNESS: 18,     // 補間の滑らかさ（秒基準、目安: 12〜20）