Patent ID: 8565494

Claim:
A biometric authentication device comprising: a biometric information acquisition unit which acquires biometric information of a user and generates a first input biometric image which represents the biometric information; a storage unit which stores data relating to registered biometric information of at least one registered user registered in advance; and a processing unit which realizes a quality judgment function which judges whether the first input biometric image is suitable or not for use for comparison of the biometric information represented in the first input biometric image with the registered biometric information; a selection function which selects registered biometric information which is similar to biometric information which is represented in the first input biometric image among the registered biometric information when the first input biometric image is judged unsuitable; and a matching process function which compares the biometric information which is represented in second input biometric image which is generated by reacquisition of the biometric information of the user by the biometric information acquisition unit and the selected registered biometric information.