An imaging device, comprising: an imaging unit having first pixels configured to photoelectrically convert a subject image which is imaged with a photographic lens and to output a first image signal, and second pixels configured to be placed discretely between the first pixels so as to photoelectrically convert each of a plurality of subject images which come from divided pupil regions formed by dividing a pupil region of the photographic lens and to output second image signals having a phase difference; an imaging control unit; a parallax information calculation unit; a plane image generation unit; and a blurring processing unit configured to determine target pixels in the plane image which are to be subjected to blurring processing, based on the parallax information calculated by the parallax information calculation unit, and to perform blurring processing on the determined target pixels in the plane image.