diff --git a/app/Http/Controllers/Web/WebController.php b/app/Http/Controllers/Web/WebController.php
index e0d0f5e..eb46b7b 100644
--- a/app/Http/Controllers/Web/WebController.php
+++ b/app/Http/Controllers/Web/WebController.php
@@ -95,6 +95,15 @@ abstract class WebController extends BaseController
      */
     protected function getParam(): IParam
     {
+        if (!property_exists(static::class, 'param')) {
+            throw new LogicException("param未定義");
+        }
+
+        $param = $this->param;
+
+        if (!is_subclass_of($param, IParam::class)) {
+            throw new LogicException("param型不正");
+        }
         return $this->param;
     }
 
diff --git a/routes/api.php b/routes/api.php
index e3c1668..671d527 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -33,6 +33,7 @@ RouteHelper::get('/receipt/download', App\Http\Controllers\Web\ReceiptIssuingOrd
 
 
 RouteHelper::get('/contracts', App\Http\Controllers\Web\Contract\ContractsController::class);
+RouteHelper::post('/contract/create', App\Http\Controllers\Web\Contract\CreateController::class);
 
 
 RouteHelper::get('/users', App\Http\Controllers\Web\LoginUser\LoginUsersController::class);