diff --git a/Sources/GoogleCloud/Storage/Bucket.swift b/Sources/GoogleCloud/Storage/Bucket.swift
index aa68ee2..6283396 100644
--- a/Sources/GoogleCloud/Storage/Bucket.swift
+++ b/Sources/GoogleCloud/Storage/Bucket.swift
@@ -12,7 +12,7 @@ public struct Bucket: Sendable {
         self.authorizedClient = authorizedClient
     }
 
-    // INFO: https://cloud.google.com/storage/docs/json_api/v1/objects/list
+    // INFO: https://docs.cloud.google.com/storage/docs/json_api/v1/objects/list
     public func files(
         prefix: String,
         logger: Logger? = nil
@@ -30,7 +30,24 @@ public struct Bucket: Sendable {
         ).items ?? []
     }
 
-    // INFO: https://cloud.google.com/storage/docs/json_api/v1/objects/delete
+    // INFO: https://docs.cloud.google.com/storage/docs/json_api/v1/objects/move
+    @discardableResult
+    public func move(
+        src: String,
+        dst: String,
+        logger: Logger? = nil
+    ) async throws -> StorageFile {
+        let src = Self.nameOnPath(name: src)
+        let dst = Self.nameOnPath(name: dst)
+        return try await authorizedClient.execute(
+            method: .POST,
+            path: "storage/v1/b/\(bucketName)/o/\(src)/moveTo/o/\(dst)",
+            logger: logger,
+            responseType: StorageFile.self
+        )
+    }
+
+    // INFO: https://docs.cloud.google.com/storage/docs/json_api/v1/objects/delete
     public func delete(
         name: String,
         logger: Logger? = nil
@@ -38,7 +55,7 @@ public struct Bucket: Sendable {
         let name = Self.nameOnPath(name: name)
         _ = try await authorizedClient.execute(
             method: .DELETE,
-            path: "storage/v1/b/\(bucketName)/o" + (name.hasPrefix("/") ? name : "/" + name),
+            path: "storage/v1/b/\(bucketName)/o/\(name)",
             logger: logger
         )
     }
@@ -75,7 +92,9 @@ public struct Bucket: Sendable {
     // INFO: https://cloud.google.com/storage/docs/request-endpoints#encoding
     static func nameOnPath(name: String) -> String {
         let targets = CharacterSet(charactersIn: " !#$&'()*+,/:;=?@[]")
-        return name.addingPercentEncoding(withAllowedCharacters: targets.inverted)!
+        return name
+            .choppingSlashPrefix
+            .addingPercentEncoding(withAllowedCharacters: targets.inverted)!
     }
 }
 
diff --git a/Sources/GoogleCloud/Storage/Entity/StorageFile.swift b/Sources/GoogleCloud/Storage/Entity/StorageFile.swift
index 749efdb..1a79271 100644
--- a/Sources/GoogleCloud/Storage/Entity/StorageFile.swift
+++ b/Sources/GoogleCloud/Storage/Entity/StorageFile.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-/// INFO: https://cloud.google.com/storage/docs/json_api/v1/objects
+/// INFO: https://docs.cloud.google.com/storage/docs/json_api/v1/objects#resource
 /// varとletは↑のwritableかどうかに対応してるけど、意味はわかっていない
 public struct StorageFile: Decodable {
     public init(name: String, bucket: String) {
diff --git a/Sources/GoogleCloudBase/AuthorizedClient.swift b/Sources/GoogleCloudBase/AuthorizedClient.swift
index 099658c..0b5714b 100644
--- a/Sources/GoogleCloudBase/AuthorizedClient.swift
+++ b/Sources/GoogleCloudBase/AuthorizedClient.swift
@@ -77,9 +77,10 @@ package struct AuthorizedClient: Sendable {
                     if let data = resBody.getData(at: resBody.readerIndex, length: resBody.readableBytes),
                        let string = String(data: data, encoding: .utf8) {
                         // 404のときなど、JSONでないレスポンスが返ることがある
-                        throw ErrorResponse(error: .init(code: Int(res.status.code), message: string))
+                        errorResponse = ErrorResponse(error: .init(code: Int(res.status.code), message: string))
+                    } else {
+                        throw error
                     }
-                    throw error
                 }
                 throw errorResponse
             }
diff --git a/Sources/GoogleCloudBase/GCPClient.swift b/Sources/GoogleCloudBase/GCPClient.swift
index adb647d..fb9afe8 100644
--- a/Sources/GoogleCloudBase/GCPClient.swift
+++ b/Sources/GoogleCloudBase/GCPClient.swift
@@ -56,7 +56,7 @@ public struct GCPClient: Sendable {
 
         public init(
             requestLogLevel: Logger.Level = .debug,
-            errorLogLevel: Logger.Level = .debug
+            errorLogLevel: Logger.Level = .error
         ) {
             self.requestLogLevel = requestLogLevel
             self.errorLogLevel = errorLogLevel
diff --git a/Tests/SharedTests/Storage/BucketTest.swift b/Tests/SharedTests/Storage/BucketTest.swift
index 774eed9..0fa7ec0 100644
--- a/Tests/SharedTests/Storage/BucketTest.swift
+++ b/Tests/SharedTests/Storage/BucketTest.swift
@@ -19,6 +19,26 @@ import Testing
         #expect(Set(response.map(\.name)) == ["testFiles/bar.png", "testFiles/baz.jpg"])
     }
 
+    @Test(.disabled("fake-gcs-server doesn't support 'move'."))
+    func move() async throws {
+        let bucket = makeBucket()
+
+        let srcName = "testMove/src/Foo.txt"
+        let dstName = "testMove/dst/Foo_renamed.txt"
+        _ = try await bucket.uploadSimple(name: srcName, media: Data(#function.utf8))
+
+        let filesBefore = try await bucket.files(prefix: srcName)
+        #expect(!filesBefore.isEmpty)
+
+        let movedFile = try await bucket.move(src: srcName, dst: dstName)
+        #expect(movedFile.name == dstName)
+
+        let filesAfterSrc = try await bucket.files(prefix: srcName)
+        #expect(filesAfterSrc.isEmpty)
+        let filesAfterDst = try await bucket.files(prefix: dstName)
+        #expect(!filesAfterDst.isEmpty)
+    }
+
     @Test func upload() async throws {
         let bucket = makeBucket()