Abstract: An authentication system 10 of this invention includes an authentication station 20 having a directory server 24 and a biometrics collation server 30 capable of collating biometrics data based on the biological features of a user, and a user terminal 60 connected to the authentication station 20 via a network 12. The biometrics data is transmitted from the user terminal 60. In the authentication station 20, the biometrics collation server 30 collates biometrics data transmitted from a user with biometrics data registered in advance. The authentication station 20 can check validity of a digital certificate 66 by the directory server 24 and collates the biometrics data, thereby allowing personal authentication.