A silicon substrate is used as a substrate body of a wiring substrate and also, plural light receiving elements for outputting a detection signal according to illuminance of light at the time of receiving light applied from the outside, an amplification circuit element for amplifying the detection signal outputted by the light receiving elements, a changeover switch element for performing switching as to whether or not the light receiving element is electrically connected to the amplification circuit element, and a resistor and a capacitor electrically connected to the amplification circuit element are disposed on the wiring substrate.