diff --git a/src/app/api/qna/file/route.ts b/src/app/api/qna/file/route.ts
index 01930f2..602bbd6 100644
--- a/src/app/api/qna/file/route.ts
+++ b/src/app/api/qna/file/route.ts
@@ -1,33 +1,73 @@
 import axios from 'axios'
 import { NextResponse } from 'next/server'
 
+// export async function GET(request: Request) {
+//   const { searchParams } = new URL(request.url)
+//   const encodeFileNo = searchParams.get('encodeFileNo')
+//   const srcFileNm = searchParams.get('srcFileNm')
+
+//   if (!encodeFileNo) {
+//     return NextResponse.json({ error: 'encodeFileNo is required' }, { status: 400 })
+//   }
+
+//   try {
+//     const response = await axios.get(`${process.env.NEXT_PUBLIC_INQUIRY_API_URL}/api/file/downloadFile2`, {
+//       params: {
+//         encodeFileNo,
+//       },
+//       responseType: 'arraybuffer',
+//     })
+
+//     if (response.headers['content-type'] === 'text/html;charset=utf-8') {
+//       return NextResponse.json({ error: 'file not found' }, { status: 404 })
+//     }
+
+//     const contentType = response.headers['content-type'] || 'application/octet-stream'
+//     const contentDisposition = response.headers['content-disposition'] || 'inline'
+
+//     return new NextResponse(response.data, {
+//       status: 200,
+//       headers: {
+//         'Content-Type': contentType,
+//         'Content-Disposition': contentDisposition,
+//       },
+//     })
+//   } catch (error: any) {
+//     console.error('File download error:', error)
+//     return NextResponse.json({ error: error.response?.data || 'Failed to download file' }, { status: 500 })
+//   }
+// }
+
 export async function GET(request: Request) {
   const { searchParams } = new URL(request.url)
   const encodeFileNo = searchParams.get('encodeFileNo')
-
-  const srcFileNm = searchParams.get('srcFileNm')
+  const srcFileNm = searchParams.get('srcFileNm') || 'downloaded-file'
 
   if (!encodeFileNo) {
     return NextResponse.json({ error: 'encodeFileNo is required' }, { status: 400 })
   }
+
+  const url = `${process.env.NEXT_PUBLIC_INQUIRY_API_URL}/api/file/downloadFile2?encodeFileNo=${encodeFileNo}`
+
   try {
-    const response = await axios.get(`${process.env.NEXT_PUBLIC_INQUIRY_API_URL}/api/file/downloadFile2`, {
-      responseType: 'arraybuffer',
-      params: {
-        encodeFileNo,
-      },
-    })
-    if (response.headers['content-type'] === 'text/html;charset=utf-8') {
-      return NextResponse.json({ error: 'file not found' }, { status: 404 })
+    const resp = await fetch(url)
+
+    if (!resp.ok) {
+      return NextResponse.json({ error: 'Failed to download file' }, { status: 500 })
     }
-    return new NextResponse(response.data, {
+
+    const contentType = resp.headers.get('content-type') || 'application/octet-stream'
+    const contentDisposition = resp.headers.get('content-disposition') || `attachment; filename="${srcFileNm}"`
+
+    return new NextResponse(resp.body, {
       status: 200,
       headers: {
-        'Content-Type': 'application/octet-stream;charset=UTF-8',
-        'Content-Disposition': `attachment; filename="${srcFileNm}"`,
+        'Content-Type': contentType,
+        'Content-Disposition': contentDisposition,
       },
     })
   } catch (error: any) {
-    return NextResponse.json({ error: error.response.data }, { status: 500 })
+    console.error('File download error:', error)
+    return NextResponse.json({ error: error.response?.data || 'Failed to download file' }, { status: 500 })
   }
 }
diff --git a/src/hooks/useInquiry.ts b/src/hooks/useInquiry.ts
index a5ed2ab..23b433e 100644
--- a/src/hooks/useInquiry.ts
+++ b/src/hooks/useInquiry.ts
@@ -76,19 +76,22 @@ export function useInquiry(
 
   const downloadFile = async (encodeFileNo: number, srcFileNm: string) => {
     try {
-      const resp = await axiosInstance(null).get<Blob>(`/api/qna/file`, { params: { encodeFileNo, srcFileNm } })
-      const blob = new Blob([resp.data], { type: 'application/octet-stream;charset=UTF-8' })
+      const resp = await fetch(`/api/qna/file?encodeFileNo=${encodeFileNo}&srcFileNm=${srcFileNm}`)
+
+      const blob = await resp.blob()
       const url = URL.createObjectURL(blob)
       const a = document.createElement('a')
       a.href = url
-      a.download = `${srcFileNm}`
+      a.download = srcFileNm
+      document.body.appendChild(a)
       a.click()
+      document.body.removeChild(a)
       URL.revokeObjectURL(url)
+
       return blob
-    } catch (error: any) {
-      if (error.response.status === 404) {
-        alert('ファイルが見つかりません')
-      }
+    } catch (error) {
+      console.error('File download error:', error)
+      alert('ファイルのダウンロードに失敗しました')
       return null
     }
   }