diff --git a/app/views/users/_training_completion_info.html.slim b/app/views/users/_training_completion_info.html.slim
index b9d74f0400e..f869a5a06a4 100644
--- a/app/views/users/_training_completion_info.html.slim
+++ b/app/views/users/_training_completion_info.html.slim
@@ -11,7 +11,7 @@
       .user-metas__item-label
         | 選択入力の研修感想
       .user-metas__item-value
-        = t("activerecord.enums.user.satisfaction.#{user.satisfaction}")
+        = user.satisfaction.nil? ? '未入力' : t("activerecord.enums.user.satisfaction.#{user.satisfaction}")
     .user-metas__item
       .user-metas__item-label
         | 自由記入の研修感想
diff --git a/test/system/training_completion_test.rb b/test/system/training_completion_test.rb
index a5e190bf9ad..e9e01072c1a 100644
--- a/test/system/training_completion_test.rb
+++ b/test/system/training_completion_test.rb
@@ -80,4 +80,17 @@ class TrainingCompletionTest < ApplicationSystemTestCase
     visit_with_auth "/users/#{users(:kensyuowata).id}", 'komagata'
     assert_text '研修終了情報（非公開）'
   end
+
+  test 'shows 未入力 when satisfaction is nil' do
+    user = users(:kensyuowata)
+    user.update!(satisfaction: nil)
+
+    visit_with_auth "/users/#{user.id}", 'komagata'
+
+    within('.user-metas.is-only-mentor', text: '研修終了情報（非公開）') do
+      within('.user-metas__item', text: '選択入力の研修感想') do
+        assert_selector '.user-metas__item-value', text: '未入力'
+      end
+    end
+  end
 end