The present invention improves an accuracy to discern a fake finger created by attaching a transparent thin film to the surface of a finger. The present invention has: a mounting surface that has a mounting area to mount an authentication target that is an object of fingerprint authentication； a transparent plate that is provided on mounting surface and defines a range of an image used for determining the authenticity of the authentication target； a light source that allows light to directly enter the authentication target mounted on the mounting area, not by way of the transparent plate； and an imaging device that images the authentication target mounted on the mounting area, by way of a the transparent plate, wherein a light emitting surface for emitting light of the light source to outside is disposed on the same plane as the mounting surface.
