This study aims to explore a primary contractor's role in conservation of textile mill as a lead for business model of using industrial heritage in Japan. In this research eight case studies were chosen from Osaka and Hyogo prefecture, as it had one of the biggest textile manufacturing areas in Japan. Results are as follows; 1) Regarding a conservation of industrial heritage, it is most important for primary contractor to judge the building's value and to have a strong leadership and decision making. The aim of the projects is not only to preserve the industrial heritage but also to perform the regional arrangement. 2) A success factor for projects of industrial heritage preservation suggests that many relevant facilities should be located around it. 3) Conservation of textile mill project requires long period and consultation, to settle on a development plan and to assemble project grant.
