About My Number System｜Digital Agency

This page explains the My Number System, which serves as the foundation of a digital society. My Number is a 12-digit identification number assigned to all Japanese residents, used in administrative procedures such as social security, taxation, and disaster response. The system enables information coordination among administrative agencies, reducing required documents and streamlining administrative processes while improving citizen convenience. It allows quick identification of individuals and enables swift provision of administrative support to those in need. The system represents critical infrastructure for realizing a fair, efficient, and just society.