diff --git a/infra/backend.ts b/infra/backend.ts
index 2b06855..4d61045 100644
--- a/infra/backend.ts
+++ b/infra/backend.ts
@@ -45,6 +45,20 @@ new aws.cloudwatch.LogGroup(`${prefix}-lambda-log-group`, {
 });
 
 
+// ---- database ----
+new aws.dynamodb.Table(`${prefix}-db`, {
+  tags,
+  name: "objects",
+  attributes: [
+    { name: "userId",  type: "S", },
+    { name: "sortKey", type: "S", },
+  ],
+  hashKey: "userId",
+  rangeKey: "sortKey",
+  billingMode: "PAY_PER_REQUEST",
+});
+
+
 // ---- API Gateway ----
 const api = new aws.apigatewayv2.Api(`${prefix}-api`, {
   tags,
diff --git a/infra/database.ts b/infra/database.ts
deleted file mode 100644
index 9bc8fa9..0000000
--- a/infra/database.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import * as aws    from "@pulumi/aws";
-import * as pulumi from "@pulumi/pulumi";
-
-import * as common from "./common";
-
-const tags   = common.tags;
-const prefix = `${common.prefix}-database`;
-
-new aws.dynamodb.Table(`${prefix}-users`, {
-  tags,
-  name: "Users",  // これがDynamoDBのTableNameになる
-  attributes: [
-    { name: "id", type: "S", },
-  ],
-  hashKey: "id",
-  billingMode: "PAY_PER_REQUEST",
-});
diff --git a/infra/index.ts b/infra/index.ts
index 05bb2ad..d57c324 100644
--- a/infra/index.ts
+++ b/infra/index.ts
@@ -4,7 +4,5 @@ import * as aws    from "@pulumi/aws";
 import * as backend  from "./backend";
 import * as frontend from "./frontend";
 
-import "./database";
-
 export const frontendDomain  = frontend.cloudfront.domainName;
 export const backendEndpoint = backend.endpoint;