diff --git a/.env.example b/.env.example
index 5199548..2067263 100644
--- a/.env.example
+++ b/.env.example
@@ -2,7 +2,7 @@
 # Copy this file to .env and adjust values for local development
 
 # AWS CDK Stage (stg or prod)
-# STAGE=stg
+STAGE=prod
 
 # Mesh Secret Key (for domain validation)
 MESH_SECRET_KEY=your-secret-key-here
diff --git a/bin/mesh-v2.ts b/bin/mesh-v2.ts
index 9776fe7..a7f94f2 100644
--- a/bin/mesh-v2.ts
+++ b/bin/mesh-v2.ts
@@ -9,8 +9,8 @@ dotenv.config({ path: path.join(__dirname, '../.env'), override: true });
 
 const app = new cdk.App();
 
-// Stage取得（デフォルト: stg）
-const stage = app.node.tryGetContext('stage') || 'stg';
+// Stage取得（優先順位: --context stage=..., .envのSTAGE, デフォルト: stg）
+const stage = app.node.tryGetContext('stage') || process.env.STAGE || 'stg';
 const stackName = stage === 'prod' ? 'MeshV2Stack' : `MeshV2Stack-${stage}`;
 
 new MeshV2Stack(app, stackName, {
diff --git a/cdk.json b/cdk.json
index 4d48f03..641dd5c 100644
--- a/cdk.json
+++ b/cdk.json
@@ -17,7 +17,6 @@
     ]
   },
   "context": {
-    "stage": "stg",
     "@aws-cdk/aws-signer:signingProfileNamePassedToCfn": true,
     "@aws-cdk/aws-ecs-patterns:secGroupsDisablesImplicitOpenListener": true,
     "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
diff --git a/lib/mesh-v2-stack.ts b/lib/mesh-v2-stack.ts
index b906a51..3fa5c48 100644
--- a/lib/mesh-v2-stack.ts
+++ b/lib/mesh-v2-stack.ts
@@ -12,8 +12,8 @@ export class MeshV2Stack extends cdk.Stack {
   constructor(scope: Construct, id: string, props?: cdk.StackProps) {
     super(scope, id, props);
 
-    // Stage取得（デフォルト: stg）
-    const stage = this.node.tryGetContext('stage') || 'stg';
+    // Stage取得（優先順位: --context stage=..., .envのSTAGE, デフォルト: stg）
+    const stage = this.node.tryGetContext('stage') || process.env.STAGE || 'stg';
     const stageSuffix = stage === 'prod' ? '' : `-${stage}`;
 
     // Stack全体にタグ付与