diff --git a/app/controllers/podcasts_controller.rb b/app/controllers/podcasts_controller.rb
index 46733c31..5412e90e 100644
--- a/app/controllers/podcasts_controller.rb
+++ b/app/controllers/podcasts_controller.rb
@@ -35,8 +35,6 @@ def show
   private
 
   def convert_shownote(content)
-    youtube_id = @episode.content.match(/watch\?v=((\w)*)/)[1]
-
     shownote = <<~HTML
       <h2 id='shownote'>
         <a href='#shownote'>🎤</a>
@@ -44,10 +42,11 @@ def convert_shownote(content)
         <small>(話したこと)</small>
       </h2>
     HTML
-
     content.gsub!(/(#+) Shownote/) { shownote }
-    return content unless content.match?(Podcast::TIMESTAMP_REGEX)
 
+    return content unless content.match?(Podcast::YOUTUBE_ID_REGEX)
+    return content unless content.match?(Podcast::TIMESTAMP_REGEX)
+    youtube_id = @episode.content.match(Podcast::YOUTUBE_ID_REGEX)[1]
     content.gsub!(Podcast::TIMESTAMP_REGEX) do
         t = $1
         t = (t.size ==  '0:00'.size) ?   '0' + t : t
diff --git a/app/models/podcast.rb b/app/models/podcast.rb
index ab490f9b..d4add910 100644
--- a/app/models/podcast.rb
+++ b/app/models/podcast.rb
@@ -2,7 +2,8 @@ class Podcast < ApplicationRecord
   self.table_name = 'podcasts'
   DIR_PATH        = 'public/podcasts'
   WDAY2JAPANESE   = %w(日 月 火 水 木 金 土)
-  TIMESTAMP_REGEX = /-\s((\d:)?\d{1,}:\d{2})/
+  TIMESTAMP_REGEX  = /-\s((\d:)?\d{1,}:\d{2})/
+  YOUTUBE_ID_REGEX = /watch\?v=((\w)*)/
 
   validates :title,          presence: true
   validates :content_size,   presence: true