diff --git a/server.ts b/server.ts
index 8b3d927..1092fc2 100644
--- a/server.ts
+++ b/server.ts
@@ -86,7 +86,7 @@ app.get("/podcast_audio/*", async (c) => {
   const file = Bun.file(audioFilePath);
   if (await file.exists()) {
     const blob = await file.arrayBuffer();
-    return c.body(blob, 200, { "Content-Type": "audio/wav" });
+    return c.body(blob, 200, { "Content-Type": "audio/mpeg" });
   }
   return c.notFound();
 });
diff --git a/services/podcast.ts b/services/podcast.ts
index 71a326a..0416df3 100644
--- a/services/podcast.ts
+++ b/services/podcast.ts
@@ -38,7 +38,7 @@ export async function updatePodcastRSS() {
         <category>${channelCategories}</category>
         <language>${channelLanguage}</language>
         <ttl>${channelTTL}</ttl>
-        <enclosure url="${fileUrl}" length="${fileSize}" type="audio/wav" />
+        <enclosure url="${fileUrl}" length="${fileSize}" type="audio/mpeg" />
         <guid>${fileUrl}</guid>
         <pubDate>${pubDate}</pubDate>
       </item>
diff --git a/services/tts.ts b/services/tts.ts
index abb3351..5b26b51 100644
--- a/services/tts.ts
+++ b/services/tts.ts
@@ -86,5 +86,9 @@ export async function generateTTS(
       .save(mp3FilePath);
   });
 
+  // Wavファイルを削除
+  fs.unlinkSync(wavFilePath);
+  console.log(`TTS生成完了: ${itemId}`);
+
   return path.basename(mp3FilePath);
 }