Patent ID: 7729518

Claim:
A biometrics authentication device, which uses blood vessel images of a body to perform individual authentication, comprising: an image capture device, which captures images of blood vessels in the body; a temperature detector, which detects the temperature of the body; an IC card reader/writer, which reads/writes an IC card which is stored characteristic data of blood vessel image of a user and the temperature at the time of registration of the blood vessel image characteristic data; and a control unit, which extracts the blood vessel image characteristic data from the captured blood vessel images and verifies captured the blood vessel image characteristic data against the blood vessel image characteristic data registered in the IC card in a verification processing, wherein the control unit detects the temperature during capture of the blood vessel image from the temperature detector, and distinguishes the cause of a verification error from the difference in the temperature detected at the time of the image capture and the temperature at the time of registration in the IC card.