A photoelectric conversion device includes a plurality of pixels each including a photoelectric conversion unit configured to output a signal based on incidence of a photon, the photoelectric conversion unit including an avalanche photodiode configured to multiply a charge resulting from the incidence of the photon by avalanche multiplication, a processing circuit configured to process the signal output from the photoelectric conversion unit, and a pixel output circuit configured to control output of a signal processed by the processing circuit; a data line connected to the plurality of pixels; and a reception circuit configured to receive a pixel signal output from the plurality of pixels via the data line. An off-leakage current of a transistor constituting the reception circuit is lower than that of a transistor constituting the pixel output circuit.