An imaging device includes a first substrate and a second substrate. The first substrate includes a pixel array unit including a plurality of pixels coupled to at least one of floating diffusion, a reset transistor, an amplification transistor and a selection transistor, each of the plurality of pixels being configured to receive incident light and output an analog signal, each pixel including a photoelectric conversion element and a transmission transistor; one of a plurality of signal lines coupled to the plurality of pixels; first plurality of through holes arranged along a first side of the pixel array; and second plurality of through holes arranged along a second side of the pixel array, the second side being vertical to the first side. The second substrate includes a column circuit including a plurality of comparators and a plurality of counters; at least a part of a control circuit, at least one of the first plurality of through holes being coupled to one of the plurality of comparators, the part of the control circuit being coupled to at least one of the second plurality of through holes, and the first substrate and the second substrate being bonded together.