Photoelectric conversion device

A photoelectric conversion device comprising:

• a light receiving unit configured to generate a light reception signal according to incident light by photoelectric conversion;
• a time-to-digital conversion unit configured to periodically perform an operation of outputting a time count value indicating an elapsed time from light emission of a light source device to input of the light reception signal every time a predetermined period elapses in one ranging period;
• and
• a comparison unit configured to perform comparison based on a first time count value output from the time-to-digital conversion unit at a first time included in the one ranging period and a second time count value output from the time-to-digital conversion unit at a second time before the first time,
• wherein the comparison unit outputs, based on a result of the comparison, either the first time count value or the second time count value as a time count value to be used for generating a frequency distribution in which a plurality of time intervals and light reception count values are associated with each other, each of the light reception count values being based on the number of times the time count values indicating corresponding time interval are output.