An embodiment includes a plurality of pixels each including a light receiving unit that outputs a pulse in response to incidence of a photon, and a signal generation unit that generates a signal in accordance with the number of pulses output from the light receiving unit, wherein the plurality of pixels includes a first pixel in which an upper limit value of a signal generated by the signal generation unit is a first value and a second pixel in which an upper limit value of a signal generated by the signal generation unit is a second value that is smaller than the first value.