A photoelectric conversion apparatus includes a photoelectric conversion area in which a plurality of photoelectric conversion elements are arranged to convert incident light into electric charges, a plurality of amplifying units are arranged to read and supply signals based on the electric charges of corresponding photoelectric conversion elements to output lines, a plurality of transfer units are arranged to transfer the electric charges of the corresponding photoelectric conversion elements to input units for corresponding amplifying units, and a plurality of voltage supply units are arranged to supply to corresponding input units voltages for setting the corresponding input units to have first and second potentials are disposed two-dimensionally, and a plurality of voltage supply control units are arranged to supply a voltage to corresponding voltage supply units of the plurality of voltage supply units.