An imaging element includes a first semiconductor substrate having a plurality of pixels arranged in a row direction and a second semiconductor substrate having a first load current source configured to supply a current to a first pixel among the plurality of pixels, a second load current source configured to supply a current to a second pixel among the plurality of pixels, a first pixel control unit configured to control supply of the current to the first pixel by the first load current source, and a second pixel control unit configured to control supply of the current to the second pixel by the second load current source.