My Number Card in Japan: Simple Guide for Foreign Residents
What the My Number Card is used for and what foreign residents should check.

- What My Number Is
- When You May Use It
- Address and Name Changes
- Keep It Safe
- If You Lose It
What My Number Is
My Number is used for tax, social security, disaster response, and other administrative procedures. The card can be used as an official ID in many situations.
When You May Use It
You may use My Number for city office procedures, tax, health insurance, bank procedures, work documents, and online applications.
Address and Name Changes
If your address or name changes, check city office procedures. Information on the card may need to be updated.
Keep It Safe
Do not show or send your My Number without a real reason. Be careful with photos, copies, and online messages.
If You Lose It
If your card is lost, check the official procedure quickly. Also ask the city office if you are worried about misuse.
This article is based on official public information and is written in simple English. Procedures may differ by person and city. Please check the official page or a consultation office for your own case.
