diff --git a/src/components/hr/CardManagement/CardDetail.tsx b/src/components/hr/CardManagement/CardDetail.tsx
index 759de542..29853597 100644
--- a/src/components/hr/CardManagement/CardDetail.tsx
+++ b/src/components/hr/CardManagement/CardDetail.tsx
@@ -25,6 +25,7 @@ import { PageHeader } from '@/components/organisms/PageHeader';
 import { ContentSkeleton } from '@/components/ui/skeleton';
 import { toast } from 'sonner';
 import { formatAmountWon as formatCurrency } from '@/lib/utils/amount';
+import type { FieldErrors } from '@/lib/api/execute-server-action';
 import type { Card as CardType, CardFormData, CardStatus } from './types';
 import {
   CARD_COMPANIES,
@@ -59,6 +60,25 @@ function getCardTypeLabel(value: string): string {
   return option?.label || value || '-';
 }
 
+// 폼 필드(camelCase) → API 필드(snake_case) 매핑
+const FORM_TO_API_FIELD: Record<string, string> = {
+  cardCompany: 'card_company',
+  cardType: 'card_type',
+  cardNumber: 'card_number',
+  cardName: 'card_name',
+  alias: 'alias',
+  expiryDate: 'expiry_date',
+  csv: 'csv',
+  paymentDay: 'payment_day',
+  pinPrefix: 'card_password',
+  totalLimit: 'total_limit',
+  usedAmount: 'used_amount',
+  remainingLimit: 'remaining_limit',
+  status: 'status',
+  userId: 'assigned_user_id',
+  memo: 'memo',
+};
+
 interface CardDetailProps {
   card?: CardType;
   mode: 'create' | 'view' | 'edit';
@@ -72,6 +92,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
   const [isSaving, setIsSaving] = useState(false);
   const [isLoadingApproval, setIsLoadingApproval] = useState(false);
   const [employees, setEmployees] = useState<Array<{ id: string; label: string }>>([]);
+  const [fieldErrors, setFieldErrors] = useState<FieldErrors>({});
 
   useEffect(() => {
     const urlMode = searchParams.get('mode');
@@ -112,37 +133,46 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
 
   const handleChange = useCallback((field: keyof CardFormData, value: string | number) => {
     setFormData(prev => ({ ...prev, [field]: value }));
+    const apiField = FORM_TO_API_FIELD[field] || field;
+    setFieldErrors(prev => {
+      if (!prev[apiField]) return prev;
+      const next = { ...prev };
+      delete next[apiField];
+      return next;
+    });
   }, []);
 
+  // API 필드명으로 에러 메시지 조회
+  const getError = (apiField: string) => fieldErrors[apiField]?.[0];
+
   const handleBack = () => {
     router.push('/ko/hr/card-management');
   };
 
   const handleSubmit = async () => {
     if (!formData.cardCompany) {
+      setFieldErrors({ card_company: ['카드사를 선택해주세요.'] });
       toast.error('카드사를 선택해주세요.');
       return;
     }
 
+    setFieldErrors({});
     setIsSaving(true);
     try {
-      if (isCreateMode) {
-        const result = await createCard(formData);
-        if (result.success) {
-          toast.success('카드가 등록되었습니다.');
-          router.push('/ko/hr/card-management');
-        } else {
-          toast.error(result.error || '카드 등록에 실패했습니다.');
-        }
+      const result = isCreateMode
+        ? await createCard(formData)
+        : card?.id ? await updateCard(card.id, formData) : null;
+
+      if (!result) return;
+
+      if (result.success) {
+        toast.success(isCreateMode ? '카드가 등록되었습니다.' : '카드가 수정되었습니다.');
+        router.push('/ko/hr/card-management');
       } else {
-        if (!card?.id) return;
-        const result = await updateCard(card.id, formData);
-        if (result.success) {
-          toast.success('카드가 수정되었습니다.');
-          router.push('/ko/hr/card-management');
-        } else {
-          toast.error(result.error || '카드 수정에 실패했습니다.');
+        if (result.fieldErrors) {
+          setFieldErrors(result.fieldErrors);
         }
+        toast.error(result.error || (isCreateMode ? '카드 등록에 실패했습니다.' : '카드 수정에 실패했습니다.'));
       }
     } catch {
       toast.error('저장 중 오류가 발생했습니다.');
@@ -158,6 +188,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
   });
 
   const handleCancel = () => {
+    setFieldErrors({});
     if (isCreateMode) {
       router.push('/ko/hr/card-management');
     } else {
@@ -398,7 +429,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.cardCompany}
                   onValueChange={(v) => handleChange('cardCompany', v)}
                 >
-                  <SelectTrigger>
+                  <SelectTrigger className={getError('card_company') ? 'border-destructive' : ''}>
                     <SelectValue placeholder="카드사 선택" />
                   </SelectTrigger>
                   <SelectContent>
@@ -407,6 +438,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                     ))}
                   </SelectContent>
                 </Select>
+                {getError('card_company') && <p className="text-xs text-destructive">{getError('card_company')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>종류</Label>
@@ -414,7 +446,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.cardType || '_none'}
                   onValueChange={(v) => handleChange('cardType', v === '_none' ? '' : v)}
                 >
-                  <SelectTrigger>
+                  <SelectTrigger className={getError('card_type') ? 'border-destructive' : ''}>
                     <SelectValue placeholder="종류 선택" />
                   </SelectTrigger>
                   <SelectContent>
@@ -424,6 +456,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                     ))}
                   </SelectContent>
                 </Select>
+                {getError('card_type') && <p className="text-xs text-destructive">{getError('card_type')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>카드번호</Label>
@@ -431,14 +464,17 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.cardNumber}
                   onChange={(v) => handleChange('cardNumber', v)}
                 />
+                {getError('card_number') && <p className="text-xs text-destructive">{getError('card_number')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>카드명</Label>
                 <Input
+                  className={getError('card_name') ? 'border-destructive' : ''}
                   value={formData.cardName}
                   onChange={(e) => handleChange('cardName', e.target.value)}
                   placeholder="카드명"
                 />
+                {getError('card_name') && <p className="text-xs text-destructive">{getError('card_name')}</p>}
               </div>
             </div>
 
@@ -447,28 +483,34 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
               <div className="space-y-2">
                 <Label>카드 별칭</Label>
                 <Input
+                  className={getError('alias') ? 'border-destructive' : ''}
                   value={formData.alias}
                   onChange={(e) => handleChange('alias', e.target.value)}
                   placeholder="별칭"
                 />
+                {getError('alias') && <p className="text-xs text-destructive">{getError('alias')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>유효기간(15/05)</Label>
                 <Input
+                  className={getError('expiry_date') ? 'border-destructive' : ''}
                   value={formData.expiryDate}
                   onChange={(e) => handleChange('expiryDate', e.target.value)}
                   placeholder="MMYY"
                   maxLength={4}
                 />
+                {getError('expiry_date') && <p className="text-xs text-destructive">{getError('expiry_date')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>CSV</Label>
                 <Input
+                  className={getError('csv') ? 'border-destructive' : ''}
                   value={formData.csv}
                   onChange={(e) => handleChange('csv', e.target.value)}
                   placeholder="CSV"
                   maxLength={4}
                 />
+                {getError('csv') && <p className="text-xs text-destructive">{getError('csv')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>결제일</Label>
@@ -476,7 +518,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.paymentDay || '_none'}
                   onValueChange={(v) => handleChange('paymentDay', v === '_none' ? '' : v)}
                 >
-                  <SelectTrigger>
+                  <SelectTrigger className={getError('payment_day') ? 'border-destructive' : ''}>
                     <SelectValue placeholder="결제일 선택" />
                   </SelectTrigger>
                   <SelectContent>
@@ -486,6 +528,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                     ))}
                   </SelectContent>
                 </Select>
+                {getError('payment_day') && <p className="text-xs text-destructive">{getError('payment_day')}</p>}
               </div>
             </div>
 
@@ -494,29 +537,35 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
               <div className="space-y-2">
                 <Label>총 한도</Label>
                 <Input
+                  className={getError('total_limit') ? 'border-destructive' : ''}
                   type="number"
                   value={formData.totalLimit || ''}
                   onChange={(e) => handleChange('totalLimit', Number(e.target.value) || 0)}
                   placeholder="0"
                 />
+                {getError('total_limit') && <p className="text-xs text-destructive">{getError('total_limit')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>사용 금액</Label>
                 <Input
+                  className={getError('used_amount') ? 'border-destructive' : ''}
                   type="number"
                   value={formData.usedAmount || ''}
                   onChange={(e) => handleChange('usedAmount', Number(e.target.value) || 0)}
                   placeholder="0"
                 />
+                {getError('used_amount') && <p className="text-xs text-destructive">{getError('used_amount')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>잔여한도</Label>
                 <Input
+                  className={getError('remaining_limit') ? 'border-destructive' : ''}
                   type="number"
                   value={formData.remainingLimit || ''}
                   onChange={(e) => handleChange('remainingLimit', Number(e.target.value) || 0)}
                   placeholder="0"
                 />
+                {getError('remaining_limit') && <p className="text-xs text-destructive">{getError('remaining_limit')}</p>}
               </div>
               <div className="space-y-2">
                 <Label>상태</Label>
@@ -524,7 +573,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.status}
                   onValueChange={(v) => handleChange('status', v as CardStatus)}
                 >
-                  <SelectTrigger>
+                  <SelectTrigger className={getError('status') ? 'border-destructive' : ''}>
                     <SelectValue placeholder="상태 선택" />
                   </SelectTrigger>
                   <SelectContent>
@@ -532,6 +581,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                     <SelectItem value="suspended">{CARD_STATUS_LABELS.suspended}</SelectItem>
                   </SelectContent>
                 </Select>
+                {getError('status') && <p className="text-xs text-destructive">{getError('status')}</p>}
               </div>
             </div>
           </CardContent>
@@ -550,7 +600,7 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                   value={formData.userId || '_none'}
                   onValueChange={(v) => handleChange('userId', v === '_none' ? '' : v)}
                 >
-                  <SelectTrigger>
+                  <SelectTrigger className={getError('assigned_user_id') ? 'border-destructive' : ''}>
                     <SelectValue placeholder="사용자 선택" />
                   </SelectTrigger>
                   <SelectContent>
@@ -560,15 +610,18 @@ export function CardDetail({ card, mode: initialMode, isLoading }: CardDetailPro
                     ))}
                   </SelectContent>
                 </Select>
+                {getError('assigned_user_id') && <p className="text-xs text-destructive">{getError('assigned_user_id')}</p>}
               </div>
               <div className="space-y-2 md:col-span-2">
                 <Label>메모</Label>
                 <Textarea
+                  className={getError('memo') ? 'border-destructive' : ''}
                   value={formData.memo}
                   onChange={(e) => handleChange('memo', e.target.value)}
                   placeholder="메모"
                   rows={2}
                 />
+                {getError('memo') && <p className="text-xs text-destructive">{getError('memo')}</p>}
               </div>
             </div>
           </CardContent>
diff --git a/src/lib/api/execute-server-action.ts b/src/lib/api/execute-server-action.ts
index 24e65e6b..96316da3 100644
--- a/src/lib/api/execute-server-action.ts
+++ b/src/lib/api/execute-server-action.ts
@@ -38,11 +38,15 @@
 import { serverFetch } from './fetch-wrapper';
 import { isNextRedirectError } from '@/lib/utils/redirect-error';
 
+// ===== 필드별 에러 타입 =====
+export type FieldErrors = Record<string, string[]>;
+
 // ===== 공통 반환 타입 =====
 export interface ActionResult<T = unknown> {
   success: boolean;
   data?: T;
   error?: string;
+  fieldErrors?: FieldErrors;
   __authError?: boolean;
 }
 
@@ -116,14 +120,26 @@ export async function executeServerAction<TApi = unknown, TResult = TApi>(
     // API 실패 응답
     if (!response.ok || !result.success) {
       let errorMsg = result.message || errorMessage;
-      // Laravel validation errors: { errors: { field: ['msg1', 'msg2'] } }
-      if (result.errors && typeof result.errors === 'object') {
-        const validationErrors = Object.values(result.errors).flat().join(', ');
+      let fieldErrors: FieldErrors | undefined;
+
+      // Laravel validation errors: { error: { code: 422, details: { field: ['msg'] } } }
+      const details = result.error?.details;
+      if (details && typeof details === 'object') {
+        fieldErrors = details as FieldErrors;
+        const validationErrors = Object.values(fieldErrors).flat().join(', ');
         if (validationErrors) errorMsg = validationErrors;
       }
+      // fallback: { errors: { field: ['msg'] } } (Laravel 기본 형식)
+      else if (result.errors && typeof result.errors === 'object') {
+        fieldErrors = result.errors as FieldErrors;
+        const validationErrors = Object.values(fieldErrors).flat().join(', ');
+        if (validationErrors) errorMsg = validationErrors;
+      }
+
       return {
         success: false,
         error: errorMsg,
+        fieldErrors,
       };
     }