To enlarge the dynamic range to the illuminance of incident light in a photodetector.

A photodetector includes a photoelectric conversion circuit 101 that generates a first voltage by converting a first current generated in accordance with the illuminance of the incident light into log-compressed voltage; a temperature compensation circuit 102 that generates a second voltage by performing temperature compensation for the first voltage and generates a second current by converting the second voltage into current; and a digital signal generation circuit 103 that generates a clock signal having an oscillation frequency depending on the second current, counts pulses of the clock signal for a certain period, and generates a digital signal using the count value for the certain period as data.