Image capturing apparatus, image capturing system, moving object, and circuit chip

An image capturing apparatus comprising:

• a first chip;
• and
• a second chip laminated on the first chip,
• the first chip including effective pixels disposed in rows and columns, and optical black pixels disposed in the rows, and including an area having the optical black pixels and a part of the effective pixels disposed in a part of the columns, and one of the part of the effective pixels being adjacent to one of the optical black pixels,
• the second chip including an AD conversion unit configured to perform AD conversion on a signal output from the optical black pixel,
• the AD conversion unit including a part overlapping, as seen in plan view, with the optical black pixel,
• the first chip further including a connection unit for connecting the optical black pixel and the AD conversion unit, and
• the connection unit being disposed at a location overlapping, as seen in plan view, with the AD conversion unit.