diff --git a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
index 78199b6..9e01dae 100644
--- a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
+++ b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
@@ -318,14 +318,15 @@ namespace DropdownContainer {
         ".control-label-text-gaia"
       );
     }
-
-    headerCells.forEach((th, index) => {
-      const label = th.textContent?.trim();
-      const field = fieldList.find((f) => f.dropDown.label === label);
-      if (field) {
+    headerCells = Array.from(headerCells);
+    for (const field of fieldList) {
+      const index = headerCells
+        .map((th) => th.textContent?.trim())
+        .findIndex((label) => label === field.dropDown.label);
+      if (index) {
         columnMap.set(index, field);
       }
-    });
+    }
     // columnMapの作成後は変更されないため、その配列バージョンを再構築しません
     columMapArray = Array.from(columnMap.entries());
     columMapValueArray = Array.from(columnMap.values());
@@ -415,10 +416,10 @@ namespace DropdownContainer {
   const selectorChangeHandle = (fieldCode: string, event: Event): void => {
     const select = event.target as HTMLSelectElement;
     state[fieldCode] = select.value; // 値を状態に同期
-
+    const currentLevel = getLevel(fieldCode);
     // すべての下位メニューをリセット
     columMapArray
-      .filter(([index, _]) => index >= getLevel(fieldCode) + 1)
+      .filter((_, arrayIndex) => arrayIndex > currentLevel)
       .forEach(([_, field]) => {
         const fieldCode = field.dropDown.code;
         updateOptions(fieldCode);