An imaging element according to an embodiment includes: a light receiving unit including a plurality of photoelectric conversion elements arranged in a lattice-pattern array, and a plurality of lenses provided for respective sets of elements on a one-to-one basis, each set of elements including two or more of the plurality of photoelectric conversion elements arranged adjacent to each other. In the light receiving unit, among a plurality of pixel sets each including the set of elements and one of the plurality of lenses provided in the set of elements, at least two pixel sets adjacent to each other are different from each other in pupil correction amount.