diff --git a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
index e671ac2..2923aa2 100644
--- a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
+++ b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
@@ -71,11 +71,11 @@ namespace DropDownConfig {
       const hash = await calculateHash(records, fields);
       const storageKey = `dropdown_dictionary::${props.dropDownApp.id}_${hash}`;
 
+      const lsDictionary = getFromLocalStorage(storageKey);
       // ローカルストレージから辞書を取得しようとし、存在しない場合は再構築
       dictionary =
-        getFromLocalStorage(storageKey) ||
-        buildDropdownDictionary(records, props.fieldList);
-      if (!getFromLocalStorage(storageKey)) {
+        lsDictionary || buildDropdownDictionary(records, props.fieldList);
+      if (!lsDictionary) {
         saveToLocalStorage(storageKey, dictionary);
       }
     } catch (error) {
@@ -157,9 +157,16 @@ namespace DropDownConfig {
   // ローカルストレージから辞書を取得
   const getFromLocalStorage = (key: string): DropdownDictionary | null => {
     const data = localStorage.getItem(key);
+    clearUpDictionary(key);
     return data ? JSON.parse(data) : null;
   };
 
+  const clearUpDictionary = (key: string) => {
+    Object.keys(localStorage)
+      .filter((k) => k.startsWith("dropdown_dictionary::") && !k.endsWith(key))
+      .forEach((k) => localStorage.removeItem(k));
+  };
+
   // 辞書をローカルストレージに保存
   const saveToLocalStorage = (key: string, data: DropdownDictionary): void => {
     localStorage.setItem(key, JSON.stringify(data));