Provided is a color sorting machine in which decreases in yield resulting from the erroneous inclusion of good granules can be prevented by using different selection algorithms and operation ejector nozzle operations resulting therefrom in a first sorting part and a second sorting part. The machine is provided with: a binarization means for binarizing images of granular objects, a flaw-detecting means for extracting flawed parts of granular objects, a reducing means for reducing images of the external contour parts of granular objects, an enlarging means for enlarging images of the flawed parts of granular objects, and a synthesis means for synthesizing the reduced images of the external contours and the enlarged images of the flawed parts; wherein on the basis of an image obtained by this synthesis means, different air-jetting operations are established for the ejection means of a first sorting part and the ejection means of a second sorting part.