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;
• 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.