diff --git a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.cs b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.cs
index 96a83c0..8ac0e69 100644
--- a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.cs
+++ b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.cs
@@ -1,71 +1,71 @@
 using System.IO;
 using System.Text;
-using AsmdefHelper.CustomCreate.Editor;
 using UnityEditor;
 using UnityEngine;
 using UnityEngine.UIElements;
-using UnityEditor.UIElements;
 
-
-// original: https://github.com/baba-s/UniAssemblyDefinitionCreator
-public class AsmdefCustomCreateView : EditorWindow {
-    [MenuItem("Assets/AsmdefHelper/Create custom asmdef")]
-    public static void ShowWindow() {
-        var window = GetWindow<AsmdefCustomCreateView>();
-        window.titleContent = new GUIContent("AsmdefCustomCreateView");
-        window.minSize = new Vector2(200,180);
-        window.maxSize = new Vector2(2000,180);
-    }
-
-    public void OnEnable() {
-        // Each editor window contains a root VisualElement object
-        VisualElement root = rootVisualElement;
-
-        // Import UXML
-        var visualTree =
-            AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
-                "Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.uxml");
-        if (visualTree == null) {
-            visualTree =
-            AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
-                "Packages/dev.n5y.asmdefhelper/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.uxml");
+namespace AsmdefHelper.CustomCreate.Editor {
+    // original: https://github.com/baba-s/UniAssemblyDefinitionCreator
+    public class AsmdefCustomCreateView : EditorWindow {
+        [MenuItem("Assets/AsmdefHelper/Create custom asmdef")]
+        public static void ShowWindow() {
+            var window = GetWindow<AsmdefCustomCreateView>();
+            window.titleContent = new GUIContent("AsmdefCustomCreateView");
+            window.minSize = new Vector2(200, 180);
+            window.maxSize = new Vector2(2000, 180);
         }
-        VisualElement labelFromUXML = visualTree.Instantiate();
-        root.Add(labelFromUXML);
 
-        // UI取得
-        var PathTextField = root.Q<TextField>(className: "PathTextField");
-        var NameTextField = root.Q<TextField>(className: "NameTextField");
-        var AllowUnsafeToggle = root.Q<Toggle>(className: "AllowUnsafeToggle");
-        var AutoReferencedToggle = root.Q<Toggle>(className: "AutoReferencedToggle");
-        var OverrideReferencesToggle = root.Q<Toggle>(className: "OverrideReferencesToggle");
-        var NoEngineReferencesToggle = root.Q<Toggle>(className: "NoEngineReferencesToggle");
-        var IsEditorToggle = root.Q<Toggle>(className: "IsEditorToggle");
-        var CreateButton = root.Q<Button>(className: "CreateButton");
+        public void OnEnable() {
+            // Each editor window contains a root VisualElement object
+            VisualElement root = rootVisualElement;
 
-        // PathとNameの初期値
-        var asset = Selection.activeObject;
-        var assetPath = AssetDatabase.GetAssetPath(asset);
-        var directory = string.IsNullOrWhiteSpace(assetPath) ? "Assets/" : assetPath;
-        PathTextField.value = directory;
-        NameTextField.value = directory.Replace("Assets/", "").Replace('/', '.');
+            // Import UXML
+            var visualTree =
+                AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
+                    "Assets/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.uxml");
+            if (visualTree == null) {
+                visualTree =
+                    AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
+                        "Packages/dev.n5y.asmdefhelper/AsmdefHelper/CustomCreate/Editor/AsmdefCustomCreateView.uxml");
+            }
 
-        // .asmdefを作成して閉じる
-        CreateButton.clickable.clicked += () => {
-            var asmdefName = NameTextField.value;
-            var asmdef = new AssemblyDefinitionJson {
-                name = asmdefName,
-                allowUnsafeCode = AllowUnsafeToggle.value,
-                autoReferenced = AutoReferencedToggle.value,
-                overrideReferences = OverrideReferencesToggle.value,
-                noEngineReferences = NoEngineReferencesToggle.value,
-                includePlatforms = IsEditorToggle.value ? new[] { "Editor" } : new string[0]
+            VisualElement labelFromUXML = visualTree.Instantiate();
+            root.Add(labelFromUXML);
+
+            // UI取得
+            var PathTextField = root.Q<TextField>(className: "PathTextField");
+            var NameTextField = root.Q<TextField>(className: "NameTextField");
+            var AllowUnsafeToggle = root.Q<Toggle>(className: "AllowUnsafeToggle");
+            var AutoReferencedToggle = root.Q<Toggle>(className: "AutoReferencedToggle");
+            var OverrideReferencesToggle = root.Q<Toggle>(className: "OverrideReferencesToggle");
+            var NoEngineReferencesToggle = root.Q<Toggle>(className: "NoEngineReferencesToggle");
+            var IsEditorToggle = root.Q<Toggle>(className: "IsEditorToggle");
+            var CreateButton = root.Q<Button>(className: "CreateButton");
+
+            // PathとNameの初期値
+            var asset = Selection.activeObject;
+            var assetPath = AssetDatabase.GetAssetPath(asset);
+            var directory = string.IsNullOrWhiteSpace(assetPath) ? "Assets/" : assetPath;
+            PathTextField.value = directory;
+            NameTextField.value = directory.Replace("Assets/", "").Replace('/', '.');
+
+            // .asmdefを作成して閉じる
+            CreateButton.clickable.clicked += () => {
+                var asmdefName = NameTextField.value;
+                var asmdef = new AssemblyDefinitionJson {
+                    name = asmdefName,
+                    allowUnsafeCode = AllowUnsafeToggle.value,
+                    autoReferenced = AutoReferencedToggle.value,
+                    overrideReferences = OverrideReferencesToggle.value,
+                    noEngineReferences = NoEngineReferencesToggle.value,
+                    includePlatforms = IsEditorToggle.value ? new[] { "Editor" } : new string[0]
+                };
+                var asmdefJson = JsonUtility.ToJson(asmdef, true);
+                var asmdefPath = $"{directory}/{asmdefName}.asmdef";
+                File.WriteAllText(asmdefPath, asmdefJson, Encoding.UTF8);
+                AssetDatabase.Refresh();
+                Close();
             };
-            var asmdefJson = JsonUtility.ToJson(asmdef, true);
-            var asmdefPath = $"{directory}/{asmdefName}.asmdef";
-            File.WriteAllText(asmdefPath, asmdefJson, Encoding.UTF8);
-            AssetDatabase.Refresh();
-            Close();
-        };
+        }
     }
 }
diff --git a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs
new file mode 100644
index 0000000..08ca10e
--- /dev/null
+++ b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs
@@ -0,0 +1,75 @@
+using System.IO;
+using System.Linq;
+using System.Text;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace AsmdefHelper.CustomCreate.Editor {
+    public class AsmdefRenameView : EditorWindow {
+        static string renameAsmdefPath = "";
+        static string asmdefDirectory = "";
+
+        [MenuItem("Assets/AsmdefHelper/Rename asmdef")]
+        public static void ShowWindow() {
+            // PathとNameの初期値
+            var asset = Selection.activeObject;
+            renameAsmdefPath = AssetDatabase.GetAssetPath(asset);
+            asmdefDirectory = Path.GetDirectoryName(renameAsmdefPath);
+            // asmdefが選択されている時のみ開く
+            var extension = renameAsmdefPath.Split('.').LastOrDefault();
+            if (extension == "asmdef") {
+                var window = GetWindow<AsmdefRenameView>();
+                window.titleContent = new GUIContent("AsmdefRenameView");
+                window.minSize = new Vector2(200, 80);
+                window.maxSize = new Vector2(2000, 80);
+            }
+        }
+
+        public void OnEnable() {
+            // Each editor window contains a root VisualElement object
+            VisualElement root = rootVisualElement;
+
+            // Import UXML
+            var visualTree =
+                AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
+                    "Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml");
+            if (visualTree == null) {
+                visualTree =
+                    AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(
+                        "Packages/dev.n5y.asmdefhelper/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml");
+            }
+
+            VisualElement labelFromUXML = visualTree.Instantiate();
+            root.Add(labelFromUXML);
+
+            // UI取得
+            var PathTextField = root.Q<TextField>(className: "PathTextField");
+            var NameTextField = root.Q<TextField>(className: "NameTextField");
+            var CreateButton = root.Q<Button>(className: "RenameButton");
+
+            // 既存のasmdef読み込み
+            var orgText = File.ReadAllText(renameAsmdefPath);
+            var asmdef = JsonUtility.FromJson<AssemblyDefinitionJson>(orgText);
+
+            // 既存パラメータの反映
+            PathTextField.value = asmdefDirectory;
+            NameTextField.value = asmdef.name;
+
+            // .asmdefのnameとファイル名を更新して閉じる
+            CreateButton.clickable.clicked += () => {
+                // nameのみ更新
+                var asmdefName = NameTextField.value;
+                asmdef.name = asmdefName;
+                var asmdefJson = JsonUtility.ToJson(asmdef, true);
+                var newAsmdefPath = $"{asmdefDirectory}/{asmdefName}.asmdef";
+                // 新asmdef作成
+                File.WriteAllText(newAsmdefPath, asmdefJson, Encoding.UTF8);
+                // 旧asmdef削除
+                File.Delete(renameAsmdefPath);
+                AssetDatabase.Refresh();
+                Close();
+            };
+        }
+    }
+}
diff --git a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs.meta b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs.meta
new file mode 100644
index 0000000..0e3469f
--- /dev/null
+++ b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 9cc99bb7ae3447c29afa7daef6d72347
+timeCreated: 1603812149
\ No newline at end of file
diff --git a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml
new file mode 100644
index 0000000..d9af47f
--- /dev/null
+++ b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<engine:UXML
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:engine="UnityEngine.UIElements"
+    xmlns:editor="UnityEditor.UIElements"
+    xsi:noNamespaceSchemaLocation="../../../../UIElementsSchema/UIElements.xsd"
+>
+    <engine:Label class="AsmdefInfo" text="Input your asmdef info"/>
+    <engine:Box>
+        <engine:TextField class="PathTextField"  label="Path" text="ASMDEF_PATH_HERE"  readonly="true"/>
+        <engine:TextField class="NameTextField"  label="Name" text="ASMDEF_NAME_HERE"/>
+        <engine:Button class="RenameButton"  text="Rename" />
+    </engine:Box>
+</engine:UXML>
diff --git a/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml.meta b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml.meta
new file mode 100644
index 0000000..5f86387
--- /dev/null
+++ b/Assets/AsmdefHelper/CustomCreate/Editor/AsmdefRenameView.uxml.meta
@@ -0,0 +1,10 @@
+fileFormatVersion: 2
+guid: 72a349d5d05ba6c4db6d137a4bc54b01
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 13804, guid: 0000000000000000e000000000000000, type: 0}