Patent ID: 8607064

Claim:
A biometric authentication device of performing authentication of a user based on biometric information, comprising: a registry information storage configured to store pre-registered biometric information as registry information; and one or more computers comprising: an acceptance value determiner configured to determine a verification acceptance value used for authentication, based on a quality value of the registry information with regard to reliability of characterizing an individual; an authentication information acquirer configured to obtain the biometric information of the user as authentication information; a similarity calculator configured to compare the authentication information of the user with the registry information and calculate similarity between the authentication information and the registry information; and an authenticator configured to identify whether the user is a registrant corresponding to the registry information, based on the similarity and the verification acceptance value, wherein the acceptance value determiner is configured to determine the verification acceptance value, which is a difference between standard acceptance value which is set as a criterion for the authentication, and a quality difference value which is a difference between a mean quality value and the quality value of the registry information of a target of the authentication.