diff --git a/apps/client/src/scenes/game/application/BombHitOrchestrator.ts b/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
index 021f26f..54f5231 100644
--- a/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
+++ b/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
@@ -16,12 +16,6 @@
   myId: string;
 };
 
-/** 爆弾爆発イベントの判定結果を表す型 */
-export type BombHitEvaluationResult = {
-  status: "duplicate" | "missing-local-player" | "no-hit" | "hit";
-  hitPlayerId: string | null;
-};
-
 /** 爆弾当たり判定の実行順序を制御する */
 export class BombHitOrchestrator {
   private readonly players: GamePlayers;
@@ -33,16 +27,19 @@
     this.myId = myId;
   }
 
-  /** 爆弾爆発イベントを受けて自プレイヤーの当たり判定を実行し結果を返す */
-  public handleBombExploded(payload: BombExplodedPayload): BombHitEvaluationResult {
+  /**
+   * 爆弾爆発イベントを受けて自プレイヤーの当たり判定を実行する
+   * @returns 被弾した場合は自プレイヤーID、それ以外は null
+   */
+  public evaluateHit(payload: BombExplodedPayload): string | null {
     if (this.handledBombIds.has(payload.bombId)) {
-      return { status: "duplicate", hitPlayerId: null };
+      return null;
     }
 
     this.handledBombIds.add(payload.bombId);
     const localCircle = this.getLocalPlayerCircle();
     if (!localCircle) {
-      return { status: "missing-local-player", hitPlayerId: null };
+      return null;
     }
 
     const result = checkBombHit({
@@ -55,11 +52,7 @@
       player: localCircle,
     });
 
-    if (!result.isHit) {
-      return { status: "no-hit", hitPlayerId: null };
-    }
-
-    return { status: "hit", hitPlayerId: this.myId };
+    return result.isHit ? this.myId : null;
   }
 
   /** 判定済み状態を初期化する */
diff --git a/apps/client/src/scenes/game/application/combat/CombatLifecycleFacade.ts b/apps/client/src/scenes/game/application/combat/CombatLifecycleFacade.ts
index 1e925bb..ad3586b 100644
--- a/apps/client/src/scenes/game/application/combat/CombatLifecycleFacade.ts
+++ b/apps/client/src/scenes/game/application/combat/CombatLifecycleFacade.ts
@@ -55,8 +55,8 @@
 
   /** 爆弾爆発時の判定と後続処理を実行する */
   public handleBombExploded(payload: BombExplodedPayload): void {
-    const result = this.bombHitOrchestrator.handleBombExploded(payload);
-    if (!result.hitPlayerId) return;
+    const hitPlayerId = this.bombHitOrchestrator.evaluateHit(payload);
+    if (!hitPlayerId) return;
 
     this.playerDeathPolicy.applyLocalHitStun();
     this.playerHitEffectOrchestrator.handleLocalBombHit(this.myId);
diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
index 95e1944..2c08386 100644
--- a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -96,9 +96,6 @@
   ): void;
 }
 
-/** 爆弾設置ユースケースが利用する出力ポート */
-export type PlaceBombOutputPort = BombPlacementOutputPort;
-
 /** start-game 系フローで利用する送信出力ポート */
 export type StartGameOutputPort = Pick<
   GameOutputPort,
@@ -145,6 +142,3 @@
   payload: BombHitReportPayload;
   nowMs: number;
 };
-
-/** 被弾報告ユースケースが利用する出力ポート */
-export type BombHitOutputPort = PlayerDeadOutputPort;
diff --git a/apps/server/src/domains/game/application/useCases/placeBombUseCase.ts b/apps/server/src/domains/game/application/useCases/placeBombUseCase.ts
index e814e83..073de20 100644
--- a/apps/server/src/domains/game/application/useCases/placeBombUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/placeBombUseCase.ts
@@ -4,7 +4,7 @@
  */
 import type {
   BombPlacementPort,
-  PlaceBombOutputPort,
+  BombPlacementOutputPort,
   PlaceBombInput,
 } from "../ports/gameUseCasePorts";
 import {
@@ -17,7 +17,7 @@
   roomId: string;
   bombStore: BombPlacementPort;
   input: PlaceBombInput;
-  output: PlaceBombOutputPort;
+  output: BombPlacementOutputPort;
 };
 
 /** 爆弾設置入力を重複排除と採番付きでルームへ配信する */
diff --git a/apps/server/src/domains/game/application/useCases/reportBombHitUseCase.ts b/apps/server/src/domains/game/application/useCases/reportBombHitUseCase.ts
index 4a675ae..e47b9eb 100644
--- a/apps/server/src/domains/game/application/useCases/reportBombHitUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/reportBombHitUseCase.ts
@@ -4,7 +4,7 @@
  * Bot被弾はサーバー側GameLoopで直接検知するため，自プレイヤーの報告のみ受け付ける
  */
 import type {
-  BombHitOutputPort,
+  PlayerDeadOutputPort,
   BombHitReportValidationPort,
   ReportBombHitInput,
 } from "../ports/gameUseCasePorts";
@@ -14,7 +14,7 @@
   roomId: string;
   validation: BombHitReportValidationPort;
   input: ReportBombHitInput;
-  output: BombHitOutputPort;
+  output: PlayerDeadOutputPort;
 };
 
 /** 被弾報告を受け取り，死亡通知を同一ルームへ配信する */
diff --git a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
index 5ac2cf9..f897f63 100644
--- a/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
+++ b/apps/server/src/network/handlers/game/createGameOutputAdapter.ts
@@ -22,6 +22,7 @@
   PlayerDeadOutputPort,
   GameOutputPort,
 } from "@server/domains/game/application/ports/gameUseCasePorts";
+import { isBotPlayerId } from "@server/domains/game/application/services/bot/index.js";
 import { sanitizeUpdatePlayersPayload } from "@server/network/adapters/gamePayloadSanitizers";
 import { createEmitToRoom } from "@server/network/adapters/socketEmitters";
 import type { CommonHandlerContext } from "../CommonHandler";
@@ -91,7 +92,7 @@
       ownerSocketId: string,
       payload: BombPlacedPayload,
     ) => {
-      if (ownerSocketId.startsWith("bot:")) {
+      if (isBotPlayerId(ownerSocketId)) {
         common.emitToRoom(roomId, protocol.SocketEvents.BOMB_PLACED, payload);
         return;
       }