1. An image pickup device, comprising: an imaging member which images a subject, and which generates image data based on the subject image; a pattern matching member which uses pattern matching to detect regions where patterns match between images based on multiple sets of said image data; and a generating composite image member which conducts alignment based on the regions that are matched by said pattern matching with respect to multiple sets of said image data that are generated by multiple imagings in an exposure time shorter than a normal exposure time while the imaging view field changes, which adds the respective sets of said image data after alignment, and which generates image data corresponding to a view field that is wider than the imaging view field of said imaging member.