diff --git a/app/Logic/ReceiptIssuingOrder/Custom/HelloTechno/PDFDownLoadManagerHelloTechno.php b/app/Logic/ReceiptIssuingOrder/Custom/HelloTechno/PDFDownLoadManagerHelloTechno.php
index 19fad8c..6aefdd1 100644
--- a/app/Logic/ReceiptIssuingOrder/Custom/HelloTechno/PDFDownLoadManagerHelloTechno.php
+++ b/app/Logic/ReceiptIssuingOrder/Custom/HelloTechno/PDFDownLoadManagerHelloTechno.php
@@ -70,11 +70,18 @@ class PDFDownLoadManagerHelloTechno extends PDFDownLoadManager
         $pdf = PDF::loadView('pdf/receipt_letters', [
             'orders' => $data
         ]);
+
+
+        $filename =  $list->count()  === 1 ? $this->getFileNameLetter() : sprintf(
+            "領収証はがき一括_%s.pdf",
+            DateUtil::now()->format('YmdHis')
+        );
         // はがきサイズを指定
         $ret = $pdf->setOption('page-height', 148)
             ->setOption('page-width', 100)
             ->setOption('encoding', 'utf-8')
-            ->inline();
+            ->inline()
+            ->header("Content-Disposition", sprintf('inline; filename=%s', $filename));
         return $ret;
     }
 
diff --git a/app/Logic/ReceiptIssuingOrder/PDFDownLoadManager.php b/app/Logic/ReceiptIssuingOrder/PDFDownLoadManager.php
index 21db602..5fa88f2 100644
--- a/app/Logic/ReceiptIssuingOrder/PDFDownLoadManager.php
+++ b/app/Logic/ReceiptIssuingOrder/PDFDownLoadManager.php
@@ -33,7 +33,8 @@ class PDFDownLoadManager extends ReceiptIssuingOrderManager
         $order = $this->order;
 
         $ret = $this->makeA4()
-            ->inline();
+            ->inline()
+            ->header("Content-Disposition", sprintf('inline; filename=%s', $this->getFileNameA4()));
         if ($order->status_receipt_download_datetime === null) {
 
             $order->status_receipt_download_datetime = DateUtil::now();
@@ -77,7 +78,9 @@ class PDFDownLoadManager extends ReceiptIssuingOrderManager
         $ret = $pdf->setOption('page-height', 148)
             ->setOption('page-width', 100)
             ->setOption('encoding', 'utf-8')
-            ->inline();
+            ->inline()
+            ->header("Content-Disposition", sprintf('inline; filename=%s', $this->getFileNameLetter()));
+
 
         return $ret;
     }
@@ -98,4 +101,13 @@ class PDFDownLoadManager extends ReceiptIssuingOrderManager
             ReceiptIssuingOrderTax::COL_NAME_TAX_AMOUNT => number_format(data_get($tax, ReceiptIssuingOrderTax::COL_NAME_TAX_AMOUNT, 0)) ?? 0,
         ];
     }
+
+    protected function getFileNameA4(): string
+    {
+        return sprintf("領収証_%s_%s.pdf", $this->order->receipt_no, DateUtil::now()->format('YmdHis'));
+    }
+    protected function getFileNameLetter(): string
+    {
+        return sprintf("領収証はがき_%s_%s.pdf", $this->order->receipt_no, DateUtil::now()->format('YmdHis'));
+    }
 }