diff --git a/app/Http/Controllers/Sales/AdminProspectController.php b/app/Http/Controllers/Sales/AdminProspectController.php
index a5554545..cd7fadf2 100644
--- a/app/Http/Controllers/Sales/AdminProspectController.php
+++ b/app/Http/Controllers/Sales/AdminProspectController.php
@@ -77,12 +77,19 @@ public function index(Request $request): View|Response
 
         $prospects = $query->orderByDesc('created_at')->paginate(20);
 
-        // 각 가망고객의 진행률 계산
+        // 각 가망고객의 진행률 계산 및 상태 자동 전환
         foreach ($prospects as $prospect) {
             $progress = SalesScenarioChecklist::getProspectProgress($prospect->id);
             $prospect->sales_progress = $progress['sales']['percentage'];
             $prospect->manager_progress = $progress['manager']['percentage'];
 
+            // 진행률 100% 시 상태 자동 전환 체크
+            if ($progress['sales']['percentage'] === 100 && $progress['manager']['percentage'] === 100) {
+                SalesScenarioChecklist::checkAndConvertProspectStatus($prospect->id);
+                // 상태가 변경되었을 수 있으므로 다시 로드
+                $prospect->refresh();
+            }
+
             // management 정보
             $management = SalesTenantManagement::where('tenant_prospect_id', $prospect->id)->first();
             $prospect->hq_status = $management?->hq_status ?? 'pending';
diff --git a/app/Http/Controllers/Sales/SalesScenarioController.php b/app/Http/Controllers/Sales/SalesScenarioController.php
index a5235b28..8a1ad2f4 100644
--- a/app/Http/Controllers/Sales/SalesScenarioController.php
+++ b/app/Http/Controllers/Sales/SalesScenarioController.php
@@ -299,10 +299,18 @@ public function toggleProspectChecklist(Request $request): JsonResponse
         $management = SalesTenantManagement::findOrCreateByProspect($prospectId);
         $management->updateProgress($scenarioType, $progress['percentage']);
 
+        // 가망고객 상태 조회 (자동 전환이 발생했을 수 있음)
+        $prospect = TenantProspect::find($prospectId);
+        $fullProgress = SalesScenarioChecklist::getProspectProgress($prospectId);
+
         return response()->json([
             'success' => true,
             'progress' => $progress,
             'checked' => $checked,
+            'prospect_status' => $prospect?->status,
+            'prospect_status_label' => $prospect?->status_label,
+            'is_converted' => $prospect?->status === TenantProspect::STATUS_CONVERTED,
+            'full_progress' => $fullProgress,
         ]);
     }
 
diff --git a/app/Models/Sales/SalesScenarioChecklist.php b/app/Models/Sales/SalesScenarioChecklist.php
index 2e4264ce..7b9a4a0d 100644
--- a/app/Models/Sales/SalesScenarioChecklist.php
+++ b/app/Models/Sales/SalesScenarioChecklist.php
@@ -131,9 +131,39 @@ public static function toggleByProspect(int $prospectId, string $scenarioType, i
         $checklist->checked_by = $checked ? $currentUserId : null;
         $checklist->save();
 
+        // 체크 완료 시 진행률 100% 확인 후 상태 자동 전환
+        if ($checked) {
+            self::checkAndConvertProspectStatus($prospectId, $currentUserId);
+        }
+
         return $checklist;
     }
 
+    /**
+     * 진행률 100% 시 가망고객 상태를 '계약완료'로 자동 전환
+     */
+    public static function checkAndConvertProspectStatus(int $prospectId, ?int $userId = null): bool
+    {
+        $progress = self::getProspectProgress($prospectId);
+
+        // 영업 시나리오와 매니저 시나리오 모두 100%인 경우에만 전환
+        if ($progress['sales']['percentage'] === 100 && $progress['manager']['percentage'] === 100) {
+            $prospect = TenantProspect::find($prospectId);
+
+            if ($prospect && $prospect->status !== TenantProspect::STATUS_CONVERTED) {
+                $prospect->update([
+                    'status' => TenantProspect::STATUS_CONVERTED,
+                    'converted_at' => now(),
+                    'converted_by' => $userId ?? auth()->id(),
+                ]);
+
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * 특정 테넌트/시나리오의 체크리스트 조회
      */