diff --git a/README.md b/README.md
index 4b1bcc3..367e27c 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,13 @@
-# Movable Do Plugin for MuseScore 3
+# Movable Do Plugin for MuseScore 3 / 4
 
-指定された調性をもとに移動ドを振る MuseScore 3 のプラグインです。
+指定された調性をもとに移動ドを振る MuseScore 3 / 4 のプラグインです。
 
 ## インストール
 
 `movable-do.qml` を[ダウンロード](https://github.com/nozomu-y/MovableDo/releases/download/v1.4/movable-do.qml)し、[MuseScore のハンドブック](https://musescore.org/ja/%E3%83%8F%E3%83%B3%E3%83%89%E3%83%96%E3%83%83%E3%82%AF/furakuin#installation)を参考にインストールしてください。
 
+MuseScore 4 での導入の際は、「プラグイン」フォルダ内に**更にもう一階層フォルダを作成**し、その中に `movable-do.qml` を移動してください。
+
 ## デモ
 
 ![demo](https://github.com/nozomu-y/MovableDo/blob/media/demo.gif?raw=true)
diff --git a/movable-do.qml b/movable-do.qml
index b872f02..67c014f 100644
--- a/movable-do.qml
+++ b/movable-do.qml
@@ -8,18 +8,31 @@
 //  License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher
 //=============================================================================
 
-import QtQuick 2.2
-import QtQuick.Controls 1.1
+import QtQuick 2.9
+import QtQuick.Controls 2.2
 import QtQuick.Layouts 1.1
 import QtQuick.Dialogs 1.2
 
 import MuseScore 3.0
+import MuseScore.UiComponents 1.0
 
 MuseScore {
+  
+    id: root
+
     version: "1.4"
     description: "This plugin inserts movable do texts derived from the given tonality"
     menuPath: "Plugins.MovableDo"
 
+    Component.onCompleted: {
+        if (mscoreMajorVersion >= 4) {
+            title = "Movable Do";
+        }
+    }
+
+    property int tonalityIndex: -1
+    property int notationIndex: -1
+
     // Small note name size is fraction of the full font size.
     property real fontSizeMini: 0.7
 
@@ -307,7 +320,7 @@ MuseScore {
             id: form
             width: exporterColumn.width + 30
             height: exporterColumn.height + 30
-            color: "lightgray"
+            color: (mscoreMajorVersion < 4 ? "lightgray" : "#F5F5F6")
             ColumnLayout {
                 id: exporterColumn
                 GridLayout {
@@ -318,21 +331,29 @@ MuseScore {
                     Label {
                         text: qsTr('調性')
                     }
-                    ComboBox {
+                    StyledDropdown {
                         id: tonality
                         model: [
                             "C-Dur", "G-Dur", "D-Dur", "A-Dur", "E-Dur", "H-Dur", "Fis-Dur", "Cis-Dur", "F-Dur", "B-Dur", "Es-Dur", "As-Dur", "Des-Dur", "Ges-Dur", "Ces-Dur",
                             "a-moll", "e-moll", "h-moll", "fis-moll", "cis-moll", "gis-moll", "dis-moll", "ais-moll", "d-moll", "g-moll", "c-moll", "f-moll", "b-moll", "es-moll", "as-moll"
                         ]
+                        currentIndex: root.tonalityIndex
+                        onActivated: function(index) {
+                            root.tonalityIndex = index
+                        }
                     }
                     Label {
                         text: qsTr('表記')
                     }
-                    ComboBox {
+                    StyledDropdown {
                         id: notation
                         model: ["d r m", "ド レ ミ"]
+                        currentIndex: root.notationIndex
+                        onActivated: function(index) {
+                            root.notationIndex = index
+                        }
                     }
-                    Button {
+                    FlatButton {
                         id: button
                         text: qsTr("決定")
                         onClicked: {
@@ -342,7 +363,7 @@ MuseScore {
                                                notation.currentIndex)
                             curScore.endCmd()
                             tonalityDialog.visible = false
-                            Qt.quit()
+                            quit()
                         }
                     }
                 }