![[My Number Card] Finally Answering What You Can’t Ask Now! A Roundup of Trivia Quizzes and Fun Facts](https://media.ragnet.co.jp/img/1200__png__https://www.studiorag.com/files/2025/08/cf2a00f4d2bdb7e16b56270ebb1b9c14.webp)
The My Number Card is a familiar part of our daily lives, and it’s actually packed with little-known facts.
“How many times can you enter the PIN incorrectly?” “When do the electronic certificates expire?” “Where do you report it if you lose the card?” We’ll cover these surprisingly unfamiliar basics in a quiz format! From practical knowledge you’ll need in everyday life to fun trivia, you’re sure to discover something new.
We’ll explain useful information in a clear, easy-to-understand way.
It’s full of tidbits you’ll want to share, so be sure to pass them along to your friends and family!
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[My Number Card] Solve the “too late to ask” questions! Collection of trivia quizzes and tidbits (1–10)
What can you do with the Mynaportal app?
- Renewal of a driver's license
- Auto-fill for tax return filing
- Automatic household budget management
See the answer
Auto-fill for tax return filing
In the Mynaportal app, you can check information related to your taxes and social security, and you can use a feature that automatically fills in the necessary information when filing your tax return. On the other hand, you cannot renew your driver’s license or automatically manage household budgets.
How many digits does the Individual Number on the My Number Card have?
- 8 digits
- 10 digits
- 12 digits
See the answer
12 digits
The personal number printed on the My Number Card is a 12-digit number assigned to every citizen. It is unique and is used across a wide range of areas, including social security, taxation, and disaster response. In principle, the same number is used for a person throughout their lifetime.
Which of the following is not correctly listed on a My Number card?
- Address
- Gender
- Occupation
See the answer
Occupation
The My Number card includes your address and gender, but it does not include your occupation. Because occupational information is not required for identity verification or administrative procedures using the My Number card, it is not listed, also from the standpoint of protecting personal information.
Which of the following is not a correct procedure for the Individual Number Card (My Number Card)?
- You must file a notification when your address changes.
- If your name changes due to marriage, you must submit a notification.
- You need to file a notification when you change jobs.
See the answer
You need to file a notification when you change jobs.
While you must complete procedures for your Individual Number Card (My Number Card) when your address or name changes due to moving or marriage, no notification is required for a job change. Therefore, even if your employer changes, you do not need to submit any notification regarding your My Number Card.
Where can I apply for or renew a My Number Card?
- convenience store
- Municipal office service counter
- police station
See the answer
Municipal office/city hall service counter
As a rule, applications and renewals for My Number Cards must be carried out at the counter of the municipal office where you are registered as a resident. Convenience stores cannot issue or renew the card, and police stations do not handle these procedures either.
How many years is the validity period of the My Number Card’s electronic certificate?
- three years
- five years
- for 10 years
See the answer
five years
The validity period of the My Number Card’s digital certificates is five years—in precise terms, until your fifth birthday after the issuance date. While the card itself is valid for ten years for adults, the digital certificates must be renewed every five years. This helps maintain security and the accuracy of identity verification.
When using a My Number Card to obtain certificates at a convenience store, after how many incorrect PIN attempts will it become unusable?
- twice
- three times
- five times
See the answer
three times
If you enter the PIN for your My Number Card incorrectly three times in a row, the card will be locked and you won’t be able to use it on the spot. To unlock it, you must complete procedures at your municipal office. Be careful not to forget your PIN.