An imaging device according to one mode of the present invention includes a taking lens formed of two or more physically separated lenses and having a plurality of regions each having an individual focal distance corresponding to a combination of the two more lenses, an image pickup element having a plurality of light-receiving sensors provided to correspond to the plurality of regions, the plurality of light-receiving sensors each selectively receiving a light beam passing through any of the plurality of regions, and an image generating unit which generates an image of a subject from an imaging signal outputted from the image pickup element.