diff --git a/app/Http/Controllers/Web/QRService/Certification/CheckDataFormatController.php b/app/Http/Controllers/Web/QRService/Certification/CheckDataFormatController.php
index f5b4a13..138039e 100644
--- a/app/Http/Controllers/Web/QRService/Certification/CheckDataFormatController.php
+++ b/app/Http/Controllers/Web/QRService/Certification/CheckDataFormatController.php
@@ -120,17 +120,17 @@ class DataConverter
     {
         $ret = new static();
 
-        $dec = QRCryptoLogic::decrypt($data);
-        if (strlen($dec) !== 30) {
-            throw new GeneralErrorMessageException("文字数不正");
-        }
-        $data = substr($dec, 5);
+        $target =  substr($data, 5);
 
-        $ret->発行端末 = substr($data, 0, 2);
-        $ret->発行日 = Carbon::createFromFormat("Ymd", substr($data, 2, 8));
-        $ret->発行連番 = intval(substr($data, 10, 6));
-        $ret->顧客コード = substr($data, 16, 4);
-        $ret->駐車場管理コード = substr($data, 20, 5);
+        $dec = QRCryptoLogic::decrypt($target);
+        if (strlen($dec) !== 15) {
+            throw new GeneralErrorMessageException("URL不正");
+        }
+        $ret->発行端末 = substr($dec, 0, 2);
+        $ret->発行日 = Carbon::createFromFormat("Ymd", substr($dec, 2, 8));
+        $ret->発行連番 = intval(substr($dec, 10, 6));
+        $ret->顧客コード = substr($dec, 16, 4);
+        $ret->駐車場管理コード = substr($dec, 20, 5);
 
 
         return $ret;