The present invention is an authentication device comprising a prism body, a first image capturing unit, and a visible light source for applying visible light to an organism, wherein the prism body is provided with an organism contact surface that is in contact with the organism, an image capturing surface that is formed at a position where the image capturing surface is opposite to and approximately parallel to the organism contact surface, and a reflection surface that is adjacent to the organism contact surface and the image capturing surface and totally reflects light reflected by the organism contact surface toward the image capturing surface, the reflection surface is provided at an angle at which light from within the prism body is totally reflected by the organism contact surface in a light path leading from the image capturing surface to the organism contact surface via the reflection surface, and the first image capturing unit captures an image of organism-reflected light obtained by the light applied from the visible light source being reflected by the organism that is in contact with the organism contact surface, and an image of reflection surface-reflected light obtained by the organism-reflected light being reflected by the reflection surface.La présente invention concerne un dispositif d'authentification comprenant un corps de prisme, une première unité de capture d'image et une source de lumière visible servant à appliquer une lumière visible sur un organisme, le corps de prisme comprenant une surface de contact d'organisme qui est en contact avec l'organisme, une surface de capture d'image qui est formée à une position qui est telle que la surface de capture d'image est opposée à la surface de contact d'organisme et lui est approximativement parallèle, et une surface de réflexion qui est adjacente à la surface de contact d'organisme et à la surface de capture d'image et qui réfléchit totalement la lumière réfléchie par la surface de contact d'organi
