1. An imaging device, comprising: an imaging section imaging a field to generate photographic image data; an image segmenting section partitioning an image of said photographic image data into a first region where a main subject is located and a second region where the main subject is not included; a blur detecting section detecting degree of blur of the image of said second region of the image of said photographic image data; and a blur enhancement section performing blur enhancement processing on the image of said second region to enlarge the degree of blur of the image after image processing, depending on the magnitude of the detected degree of blur of the image.