An imaging device comprising: a first substrate comprising: a first pixel that outputs a first pixel signal and a second pixel that outputs a second pixel signal, the second pixel being disposed adjacent to the first pixel in a first direction; a first signal line coupled to the first pixel, the first signal line being parallel to the first direction; and a second signal line (VSL 3) disposed adjacent to the first signal line, the second signal line being parallel to the first direction, the second signal line being coupled to the second pixel; and a second substrate stacked with the first substrate, the second substrate comprising; a first analog to digital converter and a second analog to digital converter; a selection unit comprising switch circuitry (131, 132, 133) that selectively couples: (i) the first signal line to the first analog to digital converter, and the second analog to digital converter selectively, and (ii) the second signal line to the first analog to digital converter, and the second analog to digital converter, and a control unit configured to control the selection unit, wherein in a first mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and the second analog to digital converter and to connect the second pixel to the first analog to digital converter and the second analog to digital converter, and in a second mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and to connect the second pixel to the second analog to digital converter. a first substrate comprising: a first pixel that outputs a first pixel signal and a second pixel that outputs a second pixel signal, the second pixel being disposed adjacent to the first pixel in a first direction; a first signal line coupled to the first pixel, the first signal line being parallel to the first direction; and a second signal line (VSL 3) disposed adjacent to the first signal line, the second signal line being parallel to the first direction, the second signal line being coupled to the second pixel; and a first pixel that outputs a first pixel signal and a second pixel that outputs a second pixel signal, the second pixel being disposed adjacent to the first pixel in a first direction; a first signal line coupled to the first pixel, the first signal line being parallel to the first direction; and a second signal line (VSL 3) disposed adjacent to the first signal line, the second signal line being parallel to the first direction, the second signal line being coupled to the second pixel; and a second substrate stacked with the first substrate, the second substrate comprising; a first analog to digital converter and a second analog to digital converter; a selection unit comprising switch circuitry (131, 132, 133) that selectively couples: (i) the first signal line to the first analog to digital converter, and the second analog to digital converter selectively, and (ii) the second signal line to the first analog to digital converter, and the second analog to digital converter, and a control unit configured to control the selection unit, wherein in a first mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and the second analog to digital converter and to connect the second pixel to the first analog to digital converter and the second analog to digital converter, and in a second mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and to connect the second pixel to the second analog to digital converter. a first analog to digital converter and a second analog to digital converter; a selection unit comprising switch circuitry (131, 132, 133) that selectively couples: (i) the first signal line to the first analog to digital converter, and the second analog to digital converter selectively, and (ii) the second signal line to the first analog to digital converter, and the second analog to digital converter, and a control unit configured to control the selection unit, wherein in a first mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and the second analog to digital converter and to connect the second pixel to the first analog to digital converter and the second analog to digital converter, and in a second mode, the control unit is configured to control the selection unit so as to connect the first pixel to the first analog to digital converter and to connect the second pixel to the second analog to digital converter.