Fingerprint recognition device and fingerprint reading window construction

1. Field of the Invention To enable easy replacement of a soiled fingerprint reading window. To reduce the number of light sources and achieve miniaturization.An aperture is formed in part of a case K constituting the outer shell of a fingerprint recognition device, aperture being covered by a cover member Cover member that covers aperture constitutes part of case K. An aperture formed in cover member is covered by a window member for fingerprint reading consisting of an optically transparent member. Window member is arranged on the under-surface of cover member and is resiliently held by the holding feet formed on cover member . Light source , light-guide plate , reflection mirrors and , image pick-up lens and image pick-up element are held by holding body H which is fixedly arranged in case K. Window member is clamped between supporting faces of holding body H and cover member so as to be immovable.Light-guide plate is arranged adjacent and inclined with respect to window member . Detection light rays from light-emitting elements are sufficiently diffused while passing through light-guide plate and are emitted in planar fashion from light-guide plate towards window member