Detection device

A detection device comprising:

• a light-transmitting light guide plate that has a first surface on one side in a first direction and on which an object to be detected is to be placed so as to overlap the first surface;
• an optical sensor that is disposed on the other side in the first direction with respect to the light guide plate so as to overlap the light guide plate and comprises a plurality of photodiodes arranged in a planar configuration;
• a light source that is disposed adjacent to the light guide plate in a second direction intersecting the first direction and is configured to emit light to a side surface of the light guide plate;
• an optical filter disposed on the other side of the guide plate;
• and
• an antenna coil disposed so as to overlap at least either one of the light guide plate and the optical sensor as viewed in the first direction, wherein
• the optical sensor, the light source, and the antenna coil are electrically coupled to a control board and
• the optical filter, the antenna coil, and the optical sensor are stacked in this order as viewed in the first direction from the other side of the light guide plate, with the optical filter facing the other side of the light guide plate.