A photoelectric converter includes a structure in which a first substrate and a second substrate are stacked, wherein a pixel array including a plurality of pixels is arranged on the first substrate, and at least part of a sample-and-hold circuit configured to sample and hold a signal output from the pixel array is arranged on the first substrate, and wherein at least part of a delta-sigma AD converter configured to convert an analog signal output from the sample-and-hold circuit into a digital signal is arranged on the second substrate.