On the other hand, the photoelectric conversion device of the present embodiment is different from that of the third embodiment including two readout circuits 30 and 50 in that the readout circuit 30 includes two comparator circuits 32 and 34 in association with each column of the pixel array in the pixel region 10. The comparator circuit 32 provided on each column is connected to the output line 16 arranged on a corresponding column. Further, the comparator circuit 34 provided on each column is connected to the output line 18 arranged on a corresponding column. The comparator circuits 32 and 34 on each column are connected to the ramp signal generation circuit 36, the counter circuit 38, and the signal processing circuit 40. That is, the comparator circuits 32 and 34 on the same column are supplied with a common ramp signal from the single ramp signal generation circuit 36 and supplied with a common count signal from the single counter circuit 38.

Other configurations and respective operations in the photoelectric conversion device according to the present embodiment are basically the same as those of the photoelectric conversion device according to the third embodiment. In the present embodiment, the function of the comparator circuit 52 of the readout circuit 50 described in the third embodiment is performed by the comparator circuit 34 of the readout circuit 30. Further, the function of the signal processing circuit 60 of the readout circuit 50 described in the third embodiment is performed by the signal processing circuit 40 of the readout circuit 30. Note that, in FIG. 9, depiction of the control circuit 70 is omitted.