To provide an imaging device capable of appropriately determining defects to be removed in a pixel unit and correcting the defect in astronomical photographing, and an image processing program.

An imaging device and an image processing program of the present invention acquire positional information of astronomical objects from a database, and generates coordinate information that can be compared with defects in a photographed image. The imaging device and image processing program then collate the coordinate information with the positions of the defects detected from the photographed image, and take only defects not corresponding to the astronomical objects as correction objects.