Mold and die are frequently used to manufacture the same products rapidly in a great quantity. The qualities of the products, especially the appearance and the functionality of the inner parts of the products, are mostly determined by the quality of the molds which are used to manufacture them. In that sense, It is very important to improve the quality of the molds in order to improve the quality of the products, but it is very difficult to control the quality of the molds because the molds were generally made by the collaboration of many companies. This problem lead to the need of effective collaboration naturally, and this paper deals with the construction and application of the web-based quality control system of molds. In order to control the quality of the molds, we construct the quality information DB for, management of the standard of the product quality and quality element by the buyer's guideline, and the quality element management system of molds and the inspection system was constructed. By using this quality management system, the quality standard and quality information could be shared by collaborating companies and applied to inspection, and consequently, the qualities of the molds were improved.