1. An image capture element comprising: a plurality of phase difference detection pixels which generate signals for performing adjusted focus decision by way of phase difference detection; and a plurality of image generation pixels which generate signals for generating an image, wherein a first pixel group formed by arranging a part of phase difference detection pixels of the plurality of phase difference detection pixels in a specific direction and a second pixel group formed by arranging a part of image generation pixels of the plurality of image generation pixels in the specific direction are alternately arranged in an orthogonal direction orthogonal to the specific direction, wherein the first pixel group comprises a first line formed by arranging in the specific direction the phase difference detection pixels to be pupil-divided in the specific direction and a second line formed by arranging in the specific direction the phase difference detection pixels to be pupil-divided in the orthogonal direction, and wherein the first line and the second line are alternately arranged across the second pixel group.