1. An injection molding system for making a molded item freely fall in a demolding process from a mold, the injection molding system comprising: a first molded item photographing device for capturing an image of the molded item falling freely and determining the position of the molded item; a second molded item photographing device for photographing the molded item to analyze the image of the molded item; a molded item movement device configured to grasp the molded item at the position of the molded item that has been determined by the first molded item photographing device and move the molded item to a photographing position for photographing the molded item by the second molded item photographing device; an image analysis unit configured to analyze the image of the molded item that has been photographed by the second molded item photographing device; and a molded item classification device configured to classify the molded item into one of a plurality of predetermined regions based on the result of the image analysis where the appearance features of the molded item are analyzed by the image analysis device.