1. A system for detecting defocused photographic images comprising an image sensor which receives light either transmitted through or reflected from photographic images recorded on a photographic film in a large number of picture elements arranged in row and column, a photometric spot forming means which forms larger photometric spots by synthetically processing the image information signals detected by said image sensor in the form of cells and smaller photometric spots corresponding to said larger photometric spots in row and column, and a defocused image detecting means which obtains density values of said photographic images at said larger and smaller photometric spots, and judges the degree of blurredness of said photographic images based on the characteristic distribution of said photometric spots.