How to Show Google Calendar Delegated Calendars on iPhone and iPad

Background

In the iPhone and iPad "Calendar" app, "Delegation" calendars registered on Google Calendar do not appear.

To display these, you need to configure the following settings on the Google account side.

Method

1. Access the following link:
   https://calendar.google.com/calendar/u/0/iphoneselect?pli=1
2. Check the calendars you want to display on your iPhone/iPad.
   
3. The delegated calendars will now appear on your iPhone.
   

Reference

I referred to the following Q&A.
https://support.google.com/calendar/thread/295404338/delegate-calendar-doesn-t-appear-on-iphone-calendar?hl=en

Afterword

As an Apple "Calendar" user, I struggled with this setting and couldn't find much information in Japanese, so I decided to write this. If you find any mistakes, please let me know in the comments.