diff --git a/.env.example b/.env.example
index 11ecad7..303757d 100644
--- a/.env.example
+++ b/.env.example
@@ -8,6 +8,7 @@ OPENAI_API_ENDPOINT=https://api.openai.com/v1
 OPENAI_MODEL_NAME=gpt-4o-mini
 
 # RSSフィードの設定
+PODCAST_BASE_URL=https://your-domain.com
 PODCAST_TITLE=自動生成ポッドキャスト
 PODCAST_LINK=https://your-domain.com/podcast
 PODCAST_DESCRIPTION=RSSフィードから自動生成された音声ポッドキャスト
diff --git a/services/podcast.ts b/services/podcast.ts
index 2518b11..01eca89 100644
--- a/services/podcast.ts
+++ b/services/podcast.ts
@@ -7,21 +7,25 @@ import fsSync from "node:fs";
 export async function updatePodcastRSS() {
   const episodes: Episode[] = await fetchAllEpisodes();
 
-  const channelTitle = process.env["PODCAST_TITLE"] ?? "自動生成ポッドキャスト";
+  const channelTitle =
+    import.meta.env["PODCAST_TITLE"] ?? "自動生成ポッドキャスト";
   const channelLink =
-    process.env["PODCAST_LINK"] ?? "https://your-domain.com/podcast";
+    import.meta.env["PODCAST_LINK"] ?? "https://your-domain.com/podcast";
   const channelDescription =
-    process.env["PODCAST_DESCRIPTION"] ??
+    import.meta.env["PODCAST_DESCRIPTION"] ??
     "RSSフィードから自動生成された音声ポッドキャスト";
-  const channelLanguage = process.env["PODCAST_LANGUAGE"] ?? "ja";
-  const channelAuthor = process.env["PODCAST_AUTHOR"] ?? "管理者";
-  const channelCategories = process.env["PODCAST_CATEGORIES"] ?? "Technology";
-  const channelTTL = process.env["PODCAST_TTL"] ?? "60";
+  const channelLanguage = import.meta.env["PODCAST_LANGUAGE"] ?? "ja";
+  const channelAuthor = import.meta.env["PODCAST_AUTHOR"] ?? "管理者";
+  const channelCategories =
+    import.meta.env["PODCAST_CATEGORIES"] ?? "Technology";
+  const channelTTL = import.meta.env["PODCAST_TTL"] ?? "60";
   const lastBuildDate = new Date().toUTCString();
+  const baseUrl =
+    import.meta.env["PODCAST_BASE_URL"] ?? "https://your-domain.com";
 
   let itemsXml = "";
   for (const ep of episodes) {
-    const fileUrl = `https://your-domain.com/podcast_audio/${path.basename(ep.audioPath)}`;
+    const fileUrl = `${baseUrl}/podcast_audio/${path.basename(ep.audioPath)}`;
     const pubDate = new Date(ep.pubDate).toUTCString();
     const fileSize = fsSync.statSync(ep.audioPath).size;
     itemsXml += `