A photoelectric conversion device comprising: a first substrate in which a plurality of blocks each including a plurality of photoelectric converters are arranged so as to form a plurality of columns and a plurality of rows; and a second substrate in which at least a part of a processing circuit for reading out signals from the plurality of photoelectric converters of each of the plurality of blocks is arranged, wherein the processing circuit is configured to drive a plurality of driving signal lines for driving the plurality of photoelectric converters of each of the plurality of blocks, the plurality of driving signal lines include a plurality of first signal lines (pRES, pSEL; pTX) each arranged in the first substrate and commonly assigned to at least two blocks arranged in a row direction of the plurality of blocks and a plurality of second signal lines (pTX, pGN, pGS, SLP) including a first-second signal line and a second-second signal line, the first-second signal line assigned to photoelectric converters arranged in a row in one block of the plurality of blocks and the second-second signal line assigned to photoelectric converters arranged in another block of the plurality of blocks of said row, the processing circuit includes a plurality of transmission lines (XPS_L, XPS_M, XPS_S) each carrying a respective one of a plurality of driving signals and a plurality of selection circuits each corresponding to a respective second signal line of the plurality of second signal lines, the plurality of transmission lines input the plurality of driving signals into each of the selection circuits; and each of the plurality of selection circuits selects one of the transmission lines from the plurality of transmission lines and supplies the driving signal carried by the selected transmission line to the corresponding second signal line of the plurality of second signal lines such that a respective exposure time of the plurality of photoelectric converters of the block to which the corresponding second signal line is assigned is set according to the driving signal carried by the selected transmission line. a first substrate in which a plurality of blocks each including a plurality of photoelectric converters are arranged so as to form a plurality of columns and a plurality of rows; and a second substrate in which at least a part of a processing circuit for reading out signals from the plurality of photoelectric converters of each of the plurality of blocks is arranged, wherein the processing circuit is configured to drive a plurality of driving signal lines for driving the plurality of photoelectric converters of each of the plurality of blocks, the plurality of driving signal lines include a plurality of first signal lines (pRES, pSEL; pTX) each arranged in the first substrate and commonly assigned to at least two blocks arranged in a row direction of the plurality of blocks and a plurality of second signal lines (pTX, pGN, pGS, SLP) including a first-second signal line and a second-second signal line, the first-second signal line assigned to photoelectric converters arranged in a row in one block of the plurality of blocks and the second-second signal line assigned to photoelectric converters arranged in another block of the plurality of blocks of said row, the processing circuit includes a plurality of transmission lines (XPS_L, XPS_M, XPS_S) each carrying a respective one of a plurality of driving signals and a plurality of selection circuits each corresponding to a respective second signal line of the plurality of second signal lines, the plurality of transmission lines input the plurality of driving signals into each of the selection circuits; and each of the plurality of selection circuits selects one of the transmission lines from the plurality of transmission lines and supplies the driving signal carried by the selected transmission line to the corresponding second signal line of the plurality of second signal lines such that a respective exposure time of the plurality of photoelectric converters of the block to which the corresponding second signal line is assigned is set according to the driving signal carried by the selected transmission line.