An imaging system capable of improving image data quality obtained through imaging optical image on a light receiving surface is provided. When a maximum diameter of an effective region of a point image projected onto a light receiving surface of the imaging device (20) through the imaging lens (10) is a size covering three or more pixels, a restoration coefficient corresponding to a state of the point image (P1) expressed by first image data (G1) output from the imaging device (20) is stored in the coefficient storage unit (30). The signal processing section (40) executes restoration processing (F) on the first image data (G1) by utilizing the restoration coefficient (K), the restoration processing being executed to generate second image data (G2) equivalent to the first image data output from the imaging device (20) when the resolving power of the imaging lens (10) is higher. The imaging lens has a first lens group, which includes at least one lens and has a positive power, and a second lens group, which includes at least one lens and in which a lens positioned closest to the image side has a negative power, in order from the object side.