1. An injection molding system for making a molded item freely fall in demolding process from a mold, the injection molding system comprising: a molded item photographing device for capturing image of the molded item fallen freely; an image analysis device configured to perform image analysis of the image photographed by the molded item photographing device; and a molded item classification device configured to classify the molded item to one of a plurality of predetermined regions based on result of the image analysis; wherein the image analysis device is configured to perform analysis of appearance feature of the molded item, and make the item classification unit classify the molded item based on result of the analysis.