diff --git a/user/src/components/Applications/Power/components/PowerFormView.tsx b/user/src/components/Applications/Power/components/PowerFormView.tsx
index ee60f2098..644b6033d 100644
--- a/user/src/components/Applications/Power/components/PowerFormView.tsx
+++ b/user/src/components/Applications/Power/components/PowerFormView.tsx
@@ -31,7 +31,7 @@ export const PowerFormView: FC<PowerFormViewProps> = ({
       />
 
       {/* 申請する場合のフォーム */}
-      {showForm && (
+      <div style={{ display: showForm ? 'block' : 'none' }}>
         <form onSubmit={handleSubmit(onSubmit)}>
           <div className="flex w-full flex-col gap-10">
             {fields.map((field, index) => (
@@ -74,7 +74,7 @@ export const PowerFormView: FC<PowerFormViewProps> = ({
             </div>
           </div>
         </form>
-      )}
+      </div>
     </div>
   );
 };
diff --git a/user/src/components/Applications/Power/hooks/usePowerApplication.ts b/user/src/components/Applications/Power/hooks/usePowerApplication.ts
index c7ba8ac5e..0536f80b9 100644
--- a/user/src/components/Applications/Power/hooks/usePowerApplication.ts
+++ b/user/src/components/Applications/Power/hooks/usePowerApplication.ts
@@ -1,4 +1,4 @@
-import { useEffect, useState } from 'react';
+import { useEffect, useMemo, useState } from 'react';
 import { useGetPowerOrders, useMutatePowerOrders } from '@/api/powerApi';
 import {
   ORDER_TYPES,
@@ -58,7 +58,14 @@ export const usePowerApplication = (groupId: number) => {
   const { submitPowerOrders, deletePowerOrder } = useMutatePowerOrders();
 
   // フォーム管理
-  const powerForm = usePowerForm(hasExisting ? { devices } : undefined);
+  const initialDefaultValues = useMemo(() => {
+    if (!hasExisting) return undefined;
+
+    return {
+      devices: devices.map((d) => ({ ...d })),
+    };
+  }, [hasExisting, devices]);
+  const powerForm = usePowerForm(initialDefaultValues);
   const { formMethods } = powerForm;
 
   // 状態更新のヘルパー関数