diff --git a/app/Http/Controllers/Web/Custom/HelloTechno/DownloadLetterController.php b/app/Http/Controllers/Web/Custom/HelloTechno/DownloadLetterController.php
index dd6e5cf..713b407 100644
--- a/app/Http/Controllers/Web/Custom/HelloTechno/DownloadLetterController.php
+++ b/app/Http/Controllers/Web/Custom/HelloTechno/DownloadLetterController.php
@@ -5,6 +5,8 @@ namespace App\Http\Controllers\Web\Custom\HelloTechno;
 use App\Http\Controllers\Web\IParam;
 use App\Http\Controllers\Web\WebController;
 use App\Logic\ReceiptIssuingOrder\Custom\HelloTechno\PDFDownLoadManagerHelloTechno;
+use App\Logic\ReceiptIssuingOrder\UpdateManager;
+use App\Util\DateUtil;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
 
@@ -22,7 +24,8 @@ class DownloadLetterController extends WebController
 
     public function __construct(
         protected DownloadLetterParam $param,
-        private PDFDownLoadManagerHelloTechno $manager
+        private UpdateManager $updateManager,
+        private PDFDownLoadManagerHelloTechno $pdfManager,
     ) {
         parent::__construct();
     }
@@ -36,6 +39,12 @@ class DownloadLetterController extends WebController
     {
         $param = $this->param;
 
-        return $this->manager->initById($param->id)->downlaodLetter();
+        // 投函日の登録
+        $today = DateUtil::now();
+        $this->updateManager->initById($param->id)
+            ->mailPosted($today)
+            ->update();
+
+        return $this->pdfManager->initById($param->id)->downlaodLetter();
     }
 }