According to one aspect of the present invention, provided is a photoelectric conversion device including a pixel region in which a plurality of pixels each including a photoelectric converter are arranged to form a plurality of rows and a plurality of columns, and a pixel control circuit that supplies control signals to the plurality of pixels, wherein the pixel region includes a first readout region, a second readout region, a third readout region, and a fourth readout region, wherein a first pixel in the first readout region and a second pixel in the second readout region are arranged on a first row and on different columns, wherein a third pixel in the third readout region and a fourth pixel in the fourth readout region are arranged on a first column and on different rows, wherein the first row on which the first pixel and the second pixel are arranged is arranged between a row on which the third pixel is arranged and a row on which the fourth pixel is arranged, and wherein the pixel control circuit performs an operation of simultaneously reading out a pixel signal of the first pixel and a pixel signal of the second pixel in a first period and performs an operation of simultaneously reading out a pixel signal of the third pixel and a pixel signal of the fourth pixel in a second period that is different from the first period.