diff --git a/lib/function/device_checkout_ledger_controller.dart b/lib/function/device_checkout_ledger_controller.dart
index 69e5af9..3184651 100644
--- a/lib/function/device_checkout_ledger_controller.dart
+++ b/lib/function/device_checkout_ledger_controller.dart
@@ -49,17 +49,27 @@ class DeviceCheckoutLedgerController extends ChangeNotifier {
     }
   }
 
-  Future<(bool success, String message)> approve(int requestId) async {
-    return _postAction('/api/device-checkout/approve', requestId);
+  // ✅ 승인 시 승인한 선생님 계정을 함께 보낸다 (대장에 "OOO 선생님이 허용했습니다" 표시 +
+  // 미반납 알림을 그 선생님에게만 보내기 위함).
+  Future<(bool success, String message)> approve(
+    int requestId, {
+    required String teacherId,
+    required String teacherName,
+  }) async {
+    return _postAction('/api/device-checkout/approve', {
+      "requestId": requestId,
+      "teacherId": teacherId,
+      "teacherName": teacherName,
+    });
   }
 
   Future<(bool success, String message)> reject(int requestId) async {
-    return _postAction('/api/device-checkout/reject', requestId);
+    return _postAction('/api/device-checkout/reject', {"requestId": requestId});
   }
 
   Future<(bool success, String message)> _postAction(
     String path,
-    int requestId,
+    Map<String, dynamic> body,
   ) async {
     _isWorking = true;
     _safeNotify();
@@ -67,7 +77,7 @@ class DeviceCheckoutLedgerController extends ChangeNotifier {
       final response = await http.post(
         Uri.parse('$baseUrl$path'),
         headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"requestId": requestId}),
+        body: jsonEncode(body),
       );
       final result = jsonDecode(utf8.decode(response.bodyBytes));
       if (response.statusCode == 200 && result['status'] == 'success') {
diff --git a/lib/ui/device_checkout_ledger_page.dart b/lib/ui/device_checkout_ledger_page.dart
index b31acef..d4d8597 100644
--- a/lib/ui/device_checkout_ledger_page.dart
+++ b/lib/ui/device_checkout_ledger_page.dart
@@ -4,7 +4,10 @@ import 'package:flutter/material.dart';
 import '../function/device_checkout_ledger_controller.dart';
 
 class DeviceCheckoutLedgerPage extends StatefulWidget {
-  const DeviceCheckoutLedgerPage({super.key});
+  final String? teacherId;
+  final String? teacherName;
+
+  const DeviceCheckoutLedgerPage({super.key, this.teacherId, this.teacherName});
 
   @override
   State<DeviceCheckoutLedgerPage> createState() =>
@@ -28,7 +31,11 @@ class _DeviceCheckoutLedgerPageState extends State<DeviceCheckoutLedgerPage> {
   }
 
   Future<void> _approve(int id) async {
-    final (_, message) = await _controller.approve(id);
+    final (_, message) = await _controller.approve(
+      id,
+      teacherId: widget.teacherId ?? '간편인증',
+      teacherName: widget.teacherName ?? '간편인증 선생',
+    );
     if (!mounted) return;
     ScaffoldMessenger.of(
       context,
@@ -48,11 +55,7 @@ class _DeviceCheckoutLedgerPageState extends State<DeviceCheckoutLedgerPage> {
       case 'PENDING':
         return (color: Colors.orange, label: '⏳ 대기중');
       case 'APPROVED':
-        return (color: Colors.blue, label: '✅ 승인됨 (픽업 대기)');
-      case 'IN_USE':
-        return (color: Colors.teal, label: '📱 사용중');
-      case 'RETURNED':
-        return (color: Colors.grey, label: '↩️ 반납완료');
+        return (color: Colors.blue, label: '✅ 승인됨');
       case 'REJECTED':
         return (color: Colors.red, label: '🚫 거절됨');
       default:
@@ -205,6 +208,19 @@ class _DeviceCheckoutLedgerPageState extends State<DeviceCheckoutLedgerPage> {
                                             fontSize: 13,
                                           ),
                                         ),
+                                        if (status == 'APPROVED' &&
+                                            r['approvedByTeacherName'] !=
+                                                null) ...[
+                                          const SizedBox(height: 2),
+                                          Text(
+                                            '👤 ${r['approvedByTeacherName']} 선생님이 허용했습니다',
+                                            style: TextStyle(
+                                              color: Colors.blue[700],
+                                              fontSize: 12,
+                                              fontWeight: FontWeight.w600,
+                                            ),
+                                          ),
+                                        ],
                                         if (isPending) ...[
                                           const SizedBox(height: 12),
                                           Row(
diff --git a/lib/ui/teacher_dashboard.dart b/lib/ui/teacher_dashboard.dart
index 7cc97be..9eef3ce 100644
--- a/lib/ui/teacher_dashboard.dart
+++ b/lib/ui/teacher_dashboard.dart
@@ -187,8 +187,10 @@ class _TeacherDashboardState extends State<TeacherDashboard> {
                             onTap: () => Navigator.push(
                               context,
                               MaterialPageRoute(
-                                builder: (context) =>
-                                    const DeviceCheckoutLedgerPage(),
+                                builder: (context) => DeviceCheckoutLedgerPage(
+                                  teacherId: widget.teacherId,
+                                  teacherName: widget.teacherName,
+                                ),
                               ),
                             ),
                           ),