A photoelectric conversion apparatus comprises a first substrate having a light-receiving array and a plurality of driving lines for supplying control signals to the array and a second substrate having a first circuit that includes a driver circuit group configured to generate the control signals and is configured to function as a vertical scanning circuit which supplies the control signals to at least some of the driving lines and a second circuit including a circuit group having the same arrangement as that of the driver circuit group. The second circuit overlaps the at least some driving lines. The at least some driving lines include a driving line not electrically connected to the second circuit. The second substrate includes, at a position overlapping the second circuit, an electrically conductive line used for power supply or transfer of a signal different from the control signals.