This paper discusses the relationships between technology and the organizational structures in supply chains of the processed products. In terms of product architecture, previous studies have discussed them under the assembly type of product rather than processed product. This paper analyzes them in supply chains, taking steel products as examples of processed products and responds to the following two research questions. First, regarding steel products, is the relationship above consistent with the viewpoint of the previous study, "Mirroring Hypothesis"? Secondly, does the organizational formation of the supply chain vary depending on the type of steel products? With regard to the first one, "Mirroring Hypothesis" proposed by Colfer and Baldwin (2010) can be conceptually applied to the processed products. Regarding the second question, comparing the cases of nails and valve springs, the formations of the supply chain are different from each other, depending on the level of customers' quality requirements. Accordingly, when JIS standard becomes a tool for quality assurance, a supply chain formation similar to the one of assembled product is observed. On the other hand, in the case of specially ordered products such as valve springs, JIS standard does not function effectively, under the strong inter-firm cooperation.
