diff --git a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
index 2923aa2..d430687 100644
--- a/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
+++ b/plugin/kintone-addins/src/actions/cascading-dropdown-selectors.ts
@@ -330,7 +330,7 @@ namespace DropdownContainer {
       const index = headerCells
         .map((th) => th.textContent?.trim())
         .findIndex((label) => label === field.dropDown.label);
-      if (index) {
+      if (index || index === 0) {
         columnMap.set(index, field);
       }
     }