An imaging device including: image generation pixels generating signals for image generation; and phase difference detection pixels generating signals for focus alignment determination by phase difference detection is disclosed. The first lines where the image generation pixels are arranged in a specific direction and second lines where the phase difference detection pixels are arranged in the specific direction are alternately arranged in a direction perpendicular to the specific direction. The image generation pixels and the phase difference detection pixels are alternately arranged so that the image generation pixels constituting the first line and the phase difference detection pixels constituting the second line adjacent to the first line overlap by portions thereof in the perpendicular direction.