To provide a thin type authentication sensor, reducing the distance from the object side end face of a lens to an image sensor.

An image sensor 1 has the size equal to that of an object, and a plurality of apertures as a light receiving part are discretely disposed. A micro-lens array 3 has micro-lenses arrayed in one-to-one correspondence with the apertures of the image sensor 1. An aperture grille 2 is disposed between the image sensor 1 and the micro-lens array 3, and adapted to transmit light along the optical axis of the apertures of the image sensor 1 and the micro-lenses of the micro-lens array 3. A filter is disposed between the object and the image sensor 1, and adapted to transmit near-infrared rays.