Imaging element, imaging device, and image processing device

An imaging element captures images of a subject by partial light beams which pass through a single optical system all together and then pass through mutually different regions, and is configured from a pixel array comprising an arrangement of a plurality of each of at least three types of pixels, including pixels without parallax, which are provided with an aperture mask that produces a point of view in the reference direction, first parallax pixels, which are provided with an aperture mask that produces a point of view in a first direction different from the reference direction, and second parallax pixels, which are provided with an aperture mask that produces a point of view in a second direction different from the reference direction, wherein, in the aperture masks of the first parallax pixels and the aperture masks of the second parallax pixels, the width of the greater-than-half-open aperture area is in the direction of change of the point of view.