<p>An imaging device (200) includes: an aberration control optical system (210) having an aberration control function to intentionally generate an aberration and an imaging element (220); and an image processing device (240) which forms a primary image into a highly accurate final image. An aberration control optical system (210A) makes the PSF to cover two or more pixels by using the aberration control optical system containing an aberration control element having an aberration control function to intentionally generate an aberration or an aberration control plane having the aberration control function. The aberration control optical system (210A) is formed as a depth extension optical system having two or more peaks of the MTF characteristic for defocus in a main image plane shift region not causing a false resolution in a predetermined frequency. As a result, it is possible to simplify the optical system at a reduced cost and expand the depth to obtain a preferable image of an appropriate image quality having a small noise affect without performing an image restoration process.</p>
