BIOMETRIC AUTHENTICATION DEVICE, BIOMETRIC AUTHENTICATION SYSTEM, AND COMPUTER PROGRAM PRODUCT

A biometric authentication device incudes: processing circuitry that implements a reception unit that receives an input of identification information of a person to be authenticated; an image acquisition unit that acquires an image of a target part of the person to be authenticated, the image taken by a camera; a guide display unit that acquires guide information associated with the identification information received by the reception unit from a file in which the identification information is associated with the guide information indicating a guide shape that is a geometric shape for positioning the target part with respect to the camera, and that causes a display device to display the guide shape indicated by the acquired guide information and the image acquired by the image acquisition unit; and an authentication unit that performs authentication based on the image acquired by the image acquisition unit.