diff --git a/simple-translate/background.js b/simple-translate/background.js
index eea7abf..4d5b388 100644
--- a/simple-translate/background.js
+++ b/simple-translate/background.js
@@ -24,23 +24,6 @@ function showMenu() {
     } else menuRemove();
 }
 
-function initialSetting() {
-    switch (browser.i18n.getUILanguage()) { //一部の言語はブラウザの設定に合わせる
-        case "ja":
-        case "zh-CN":
-        case "zh-TW":
-        case "ko":
-        case "ru":
-            targetLang = browser.i18n.getUILanguage();
-            secondTargetLang = "en";
-            break;
-        default:
-            targetLang = "en";
-            secondTargetLang = "ja";
-            break;
-    }
-}
-
 //メニューを表示
 function menuCreate() {
     browser.contextMenus.create({
diff --git a/simple-translate/options/options.js b/simple-translate/options/options.js
index aac574f..d26fd4a 100644
--- a/simple-translate/options/options.js
+++ b/simple-translate/options/options.js
@@ -23,6 +23,7 @@ function setLangList() {
     targetLang.innerHTML = langListHtml;
     secondTargetLang.innerHTML = langListHtml;
 
+    initialSetting();
 }
 
 function alphabeticallySort(a, b) {
@@ -33,6 +34,26 @@ function alphabeticallySort(a, b) {
     }
 }
 
+function initialSetting() {
+    switch (browser.i18n.getUILanguage()) { //一部の言語はブラウザの設定に合わせる
+        case "ja":
+        case "zh-CN":
+        case "zh-TW":
+        case "ko":
+        case "ru":
+        case "de":
+        case "fr":
+        case "it":
+            targetLang.value = browser.i18n.getUILanguage();
+            secondTargetLang.value = "en";
+            break;
+        default:
+            targetLang.value = "en";
+            secondTargetLang.value = "ja";
+            break;
+    }
+}
+
 S.initOptionsPage().then(function () {
     const saveByChangeItems = document.getElementsByClassName("saveByChange");
     for (let item of saveByChangeItems) {