diff --git a/apps/client/src/scenes/game/application/BombHitContextProvider.ts b/apps/client/src/scenes/game/application/BombHitContextProvider.ts
index 584d88e..dd38584 100644
--- a/apps/client/src/scenes/game/application/BombHitContextProvider.ts
+++ b/apps/client/src/scenes/game/application/BombHitContextProvider.ts
@@ -5,7 +5,9 @@
  */
 import { config } from "@client/config";
 import { LocalPlayerController } from "@client/scenes/game/entities/player/PlayerController";
-import type { TeamCollisionCircle } from "@client/scenes/game/entities/bomb/BombHitDetector";
+import type { domain } from "@repo/shared";
+
+type TeamCollisionCircle = domain.game.TeamCollisionCircle;
 import type { GamePlayers } from "./game.types";
 
 /** 被弾判定と報告に利用するプレイヤー円情報 */
diff --git a/apps/client/src/scenes/game/application/BombHitOrchestrator.ts b/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
index 4cebadc..a466e8d 100644
--- a/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
+++ b/apps/client/src/scenes/game/application/BombHitOrchestrator.ts
@@ -3,7 +3,9 @@
  * 爆弾爆発イベントとローカルプレイヤー情報を橋渡しして当たり判定を実行する
  * 判定結果を呼び出し元へ返して後続処理へ接続しやすくする
  */
-import { checkBombHit } from "@client/scenes/game/entities/bomb/BombHitDetector";
+import { domain } from "@repo/shared";
+
+const { checkBombHit } = domain.game;
 import type { BombExplodedPayload } from "@client/scenes/game/entities/bomb/BombManager";
 import { BombHitContextProvider } from "./BombHitContextProvider";
 
diff --git a/apps/client/src/scenes/game/entities/bomb/BombHitDetector.ts b/apps/client/src/scenes/game/entities/bomb/BombHitDetector.ts
deleted file mode 100644
index 7bee698..0000000
--- a/apps/client/src/scenes/game/entities/bomb/BombHitDetector.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * BombHitDetector
- * 爆弾とプレイヤーの円当たり判定を行う純関数を提供する
- * 同チーム無効判定と二乗距離比較をまとめて扱う
- */
-
-/** 円当たり判定に利用する座標と半径の基本型 */
-export type CollisionCircle = {
-  x: number;
-  y: number;
-  radius: number;
-};
-
-/** チーム判定を伴う円当たり判定の入力型 */
-export type TeamCollisionCircle = CollisionCircle & {
-  teamId: number;
-};
-
-/** 爆弾当たり判定の入力型 */
-export type BombHitCheckInput = {
-  bomb: TeamCollisionCircle;
-  player: TeamCollisionCircle;
-};
-
-/** 爆弾当たり判定の結果型 */
-export type BombHitCheckResult = {
-  isHit: boolean;
-  isSameTeam: boolean;
-  distanceSquared: number;
-  thresholdSquared: number;
-};
-
-/** 爆弾とプレイヤーの当たり判定を実行する */
-export const checkBombHit = ({ bomb, player }: BombHitCheckInput): BombHitCheckResult => {
-  const isSameTeam = bomb.teamId === player.teamId;
-  const deltaX = bomb.x - player.x;
-  const deltaY = bomb.y - player.y;
-  const distanceSquared = deltaX * deltaX + deltaY * deltaY;
-  const sumRadius = bomb.radius + player.radius;
-  const thresholdSquared = sumRadius * sumRadius;
-  const isHit = !isSameTeam && distanceSquared < thresholdSquared;
-
-  return {
-    isHit,
-    isSameTeam,
-    distanceSquared,
-    thresholdSquared,
-  };
-};
diff --git a/packages/shared/src/domains/game/bombHit.logic.ts b/packages/shared/src/domains/game/bombHit.logic.ts
new file mode 100644
index 0000000..54907b0
--- /dev/null
+++ b/packages/shared/src/domains/game/bombHit.logic.ts
@@ -0,0 +1,27 @@
+/**
+ * bombHit.logic
+ * 爆弾とプレイヤーの円当たり判定を行う純関数を提供する
+ * 同チーム無効判定と二乗距離比較をまとめて扱う
+ */
+import type { BombHitCheckInput, BombHitCheckResult } from "./bombHit.type";
+
+/** 爆弾とプレイヤーの当たり判定を実行する */
+export const checkBombHit = ({
+  bomb,
+  player,
+}: BombHitCheckInput): BombHitCheckResult => {
+  const isSameTeam = bomb.teamId === player.teamId;
+  const deltaX = bomb.x - player.x;
+  const deltaY = bomb.y - player.y;
+  const distanceSquared = deltaX * deltaX + deltaY * deltaY;
+  const sumRadius = bomb.radius + player.radius;
+  const thresholdSquared = sumRadius * sumRadius;
+  const isHit = !isSameTeam && distanceSquared < thresholdSquared;
+
+  return {
+    isHit,
+    isSameTeam,
+    distanceSquared,
+    thresholdSquared,
+  };
+};
diff --git a/packages/shared/src/domains/game/bombHit.type.ts b/packages/shared/src/domains/game/bombHit.type.ts
new file mode 100644
index 0000000..6be0147
--- /dev/null
+++ b/packages/shared/src/domains/game/bombHit.type.ts
@@ -0,0 +1,31 @@
+/**
+ * bombHit.type
+ * 爆弾当たり判定で利用する共有型を定義する
+ * 円同士の衝突判定とチーム判定に必要な型を提供する
+ */
+
+/** 円当たり判定に利用する座標と半径の基本型 */
+export type CollisionCircle = {
+  x: number;
+  y: number;
+  radius: number;
+};
+
+/** チーム判定を伴う円当たり判定の入力型 */
+export type TeamCollisionCircle = CollisionCircle & {
+  teamId: number;
+};
+
+/** 爆弾当たり判定の入力型 */
+export type BombHitCheckInput = {
+  bomb: TeamCollisionCircle;
+  player: TeamCollisionCircle;
+};
+
+/** 爆弾当たり判定の結果型 */
+export type BombHitCheckResult = {
+  isHit: boolean;
+  isSameTeam: boolean;
+  distanceSquared: number;
+  thresholdSquared: number;
+};
diff --git a/packages/shared/src/domains/game/index.ts b/packages/shared/src/domains/game/index.ts
index 3b3cd6b..4728014 100644
--- a/packages/shared/src/domains/game/index.ts
+++ b/packages/shared/src/domains/game/index.ts
@@ -6,3 +6,14 @@
 
 /** ゲーム進行関連の型を再公開する */
 export type { PlayerPositionUpdate, TickData } from "./game.type";
+
+/** 爆弾当たり判定の型を再公開する */
+export type {
+  CollisionCircle,
+  TeamCollisionCircle,
+  BombHitCheckInput,
+  BombHitCheckResult,
+} from "./bombHit.type";
+
+/** 爆弾当たり判定ロジックを再公開する */
+export { checkBombHit } from "./bombHit.logic";