A photoelectric conversion apparatus comprising: a photoelectric conversion area including a plurality of pixels arranged two-dimensionally in a plurality of rows and a plurality of columns, wherein each of the pixels comprises a photoelectric conversion element arranged to convert incident light into electric carriers; an amplifying means arranged to read and supply signals based on the electric carriers of corresponding photoelectric conversion element to an output line; a transfer means arranged to transfer the electric carriers of said photoelectric conversion element to input means of the amplifying means; and a MOS transistor arranged to supply to the input means voltages for setting said input means to have at least first and second potentials; wherein the photoelectric conversion apparatus further includes a plurality of power supply lines (12, 13) arranged to supply the voltages to said plurality of MOS transistors; and, for each of the rows of the plurality of rows: a respective control line for controlling the MOS transistors of the pixels of the respective row, characterized by a selection line, and for each of the columns of the plurality of columns: a power supply channel and a voltage supply control means, wherein the voltage supply control means is disposed in the respective power supply channel between said plurality of power supply lines (12, 13) and the MOS transistors arranged in the pixels of the respective column, wherein each of the voltage supply control means is arranged to control the voltage supplied to said MOS transistors of the pixels of the respective column, wherein the voltage supply control means of each of the columns are connected to the selecting line and each of the voltage supply control means is arranged to control the voltage supplied to said MOS transistors based on a signal on the selecting line. a photoelectric conversion area including a plurality of pixels arranged two-dimensionally in a plurality of rows and a plurality of columns, wherein each of the pixels comprises a photoelectric conversion element arranged to convert incident light into electric carriers; an amplifying means arranged to read and supply signals based on the electric carriers of corresponding photoelectric conversion element to an output line; a transfer means arranged to transfer the electric carriers of said photoelectric conversion element to input means of the amplifying means; and a MOS transistor arranged to supply to the input means voltages for setting said input means to have at least first and second potentials; wherein a photoelectric conversion element arranged to convert incident light into electric carriers; an amplifying means arranged to read and supply signals based on the electric carriers of corresponding photoelectric conversion element to an output line; a transfer means arranged to transfer the electric carriers of said photoelectric conversion element to input means of the amplifying means; and a MOS transistor arranged to supply to the input means voltages for setting said input means to have at least first and second potentials; wherein a plurality of power supply lines (12, 13) arranged to supply the voltages to said plurality of MOS transistors; and, for each of the rows of the plurality of rows: a respective control line for controlling the MOS transistors of the pixels of the respective row, a selection line, and for each of the columns of the plurality of columns: a power supply channel and a voltage supply control means, wherein the voltage supply control means is disposed in the respective power supply channel between said plurality of power supply lines (12, 13) and the MOS transistors arranged in the pixels of the respective column, wherein each of the voltage supply control means is arranged to control the voltage supplied to said MOS transistors of the pixels of the respective column,