www.digital.go.jp/policies/mynumber/explanation

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マイナンバー制度とは｜デジタル庁

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https://www.digital.go.jp/policies/mynumber/explanation

About this page

This page explains Japan's My Number system managed by the Digital Agency. The My Number system is infrastructure for digital society, improving citizen convenience and administrative efficiency to create a fairer society. It assigns a 12-digit number to all residents with residency, used in social security, taxation, and disaster management. Administrative information sharing reduces required documents for procedures. The page covers the public fund account registration system and deposit account assignment system. Multiple security measures are implemented at both institutional and system levels, including personal information protection and restrictions on My Number collection and storage.