diff --git a/app/Http/Controllers/ESign/EsignApiController.php b/app/Http/Controllers/ESign/EsignApiController.php
index 32347c8c..38afa2fa 100644
--- a/app/Http/Controllers/ESign/EsignApiController.php
+++ b/app/Http/Controllers/ESign/EsignApiController.php
@@ -258,11 +258,20 @@ public function send(Request $request, int $id): JsonResponse
             'updated_by' => auth()->id(),
         ]);
 
-        // 첫 번째 서명자 상태 변경 + 메일 발송
-        $nextSigner = $contract->signers()->orderBy('sign_order')->first();
-        if ($nextSigner) {
-            $nextSigner->update(['status' => 'notified']);
-            Mail::to($nextSigner->email)->send(new EsignRequestMail($contract, $nextSigner));
+        // 서명 순서 유형에 따라 알림 발송
+        if ($contract->sign_order_type === 'parallel') {
+            // 동시 서명: 모든 서명자에게 발송
+            foreach ($contract->signers as $s) {
+                $s->update(['status' => 'notified']);
+                Mail::to($s->email)->send(new EsignRequestMail($contract, $s));
+            }
+        } else {
+            // 순차 서명: 첫 번째 서명자에게만 발송
+            $nextSigner = $contract->signers()->orderBy('sign_order')->first();
+            if ($nextSigner) {
+                $nextSigner->update(['status' => 'notified']);
+                Mail::to($nextSigner->email)->send(new EsignRequestMail($contract, $nextSigner));
+            }
         }
 
         EsignAuditLog::create([
diff --git a/app/Http/Controllers/ESign/EsignPublicController.php b/app/Http/Controllers/ESign/EsignPublicController.php
index 5552485e..fc772f99 100644
--- a/app/Http/Controllers/ESign/EsignPublicController.php
+++ b/app/Http/Controllers/ESign/EsignPublicController.php
@@ -8,6 +8,8 @@
 use App\Models\ESign\EsignSigner;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
+use App\Mail\EsignRequestMail;
+use Illuminate\Support\Facades\Mail;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Support\Str;
 use Illuminate\View\View;
@@ -243,6 +245,29 @@ public function submitSignature(Request $request, string $token): JsonResponse
             ]);
         } else {
             $contract->update(['status' => 'partially_signed']);
+
+            // 다음 서명자에게 자동 알림 발송 (순차 서명)
+            $nextSigner = EsignSigner::withoutGlobalScopes()
+                ->where('contract_id', $contract->id)
+                ->whereIn('status', ['waiting', 'pending'])
+                ->orderBy('sign_order')
+                ->first();
+
+            if ($nextSigner) {
+                $nextSigner->update(['status' => 'notified']);
+                Mail::to($nextSigner->email)->send(new EsignRequestMail($contract, $nextSigner));
+
+                EsignAuditLog::create([
+                    'tenant_id' => $contract->tenant_id,
+                    'contract_id' => $contract->id,
+                    'signer_id' => $nextSigner->id,
+                    'action' => 'sign_request_sent',
+                    'ip_address' => $request->ip(),
+                    'user_agent' => $request->userAgent(),
+                    'metadata' => ['triggered_by' => 'auto_after_sign'],
+                    'created_at' => now(),
+                ]);
+            }
         }
 
         return response()->json(['success' => true, 'message' => '서명이 완료되었습니다.']);