Notice Concerning the Case in which Account Information with Erroneous Registration of public fund receiving account was Available for Inspection (as of December 22, 2023)

Outline (Causes and Responses)

As part of our support for Individual Number Card Point application procedures in each local government, we also received cooperation from Registration of public money receiving account.
When the Mynaportal was operated on the shared terminal of this support window, the person who operated first was not able to log out, and as a result, there was an incident in which the deposit account of the person who was registered on the same terminal after the account operation of the person who operated first was mistakenly registered.
In this case, the account information (name in kana, name of bank, name of branch office, account type, and account number) of the person who registered later in Mynaportal from the account of the person who registered first was available for viewing.

At Digital Agency, we have been working on the development of the detection model to improve the extraction method of linking errors, and we have confirmed that there is a person whose name in the deposit account registered as a public fund receiving account and his / her registered name may not match between the My Number Information full investigation Headquarter (4th) on November 9, 2023 and the My Number Information full investigation Headquarter (5th) on December 12, 2023.
Since December 7, 2023, we have taken measures to stop viewing account information in Mynaportal (Note) for these accounts. At present, the misregistered account information can no longer be viewed from the misregistered accounts. In addition, we have not confirmed the occurrence of damage such as unauthorized use of the misregistered account information. If there is a possibility that the name of the person in question and the name of the account holder do not match, Digital Agency has sent a letter by mail to inform us of the change or deletion of the public fund receiving account. For details, please refer to 's "We have sent a letter by mail to those who may not have registered a savings account in the name of the person in question in public fund receiving account (as of December 22, 2023)" .

(Note) Although it is not a misregistration, if you think that you are registering an account of your family instead of yourself, we do not suspend access in Mynaportal, but please change the account to the name of yourself.

Recurrence Prevention Measures

For accounts with a high possibility of misregistration, we have already taken measures to stop viewing account information in Mynaportal. In addition, in order to prevent misregistration and leakage of account information due to misregistration in the future, we have already added a function to confirm that the person to be registered has not changed in the course of account registration by re-reading My Number Card at the time of completion of account registration in addition to the start of account registration, and to prevent misregistration due to forgetting to log out.

We will make sincere efforts to prevent a recurrence and continue to make efforts to secure trust so that people can conduct Registration of public money receiving account operations with peace of mind.

*In accordance with the provisions of Article 68, Paragraph 2 of the personal data Protection Act (Act No. 57 of 2003), this notice is to inform you that the misregistered account information may have been viewed by another person.

Contact information

Inquiries about this matter and My Number
My Number General Toll-free Number (0120-95-0178)
*When making an inquiry, follow the voice guidance and proceed to "6".