diff --git a/app/Services/BusinessCardOcrService.php b/app/Services/BusinessCardOcrService.php
index d3ff331b..15bf9034 100644
--- a/app/Services/BusinessCardOcrService.php
+++ b/app/Services/BusinessCardOcrService.php
@@ -53,7 +53,7 @@ private function callVertexAiApi(AiConfig $config, string $base64Image): array
         return $this->callGeminiApi($url, $base64Image, [
             'Authorization' => 'Bearer ' . $accessToken,
             'Content-Type' => 'application/json',
-        ]);
+        ], true);  // Vertex AI
     }
 
     /**
@@ -69,13 +69,13 @@ private function callGoogleAiStudioApi(AiConfig $config, string $base64Image): a
 
         return $this->callGeminiApi($url, $base64Image, [
             'Content-Type' => 'application/json',
-        ]);
+        ], false);  // Google AI Studio
     }
 
     /**
      * Gemini API 공통 호출 로직
      */
-    private function callGeminiApi(string $url, string $base64Image, array $headers): array
+    private function callGeminiApi(string $url, string $base64Image, array $headers, bool $isVertexAi = false): array
     {
         // Base64 데이터에서 prefix 제거
         $imageData = $base64Image;
@@ -88,25 +88,30 @@ private function callGeminiApi(string $url, string $base64Image, array $headers)
 
         $prompt = $this->buildPrompt();
 
+        // Vertex AI는 role 필드 필요
+        $content = [
+            'parts' => [
+                [
+                    'inlineData' => [
+                        'mimeType' => $mimeType,
+                        'data' => $imageData,
+                    ],
+                ],
+                [
+                    'text' => $prompt,
+                ],
+            ],
+        ];
+
+        if ($isVertexAi) {
+            $content['role'] = 'user';
+        }
+
         try {
             $response = Http::timeout(30)
                 ->withHeaders($headers)
                 ->post($url, [
-                    'contents' => [
-                        [
-                            'parts' => [
-                                [
-                                    'inlineData' => [
-                                        'mimeType' => $mimeType,
-                                        'data' => $imageData,
-                                    ],
-                                ],
-                                [
-                                    'text' => $prompt,
-                                ],
-                            ],
-                        ],
-                    ],
+                    'contents' => [$content],
                     'generationConfig' => [
                         'temperature' => 0.1,
                         'topK' => 40,