Recently, some urban facilities have become multi-functional, and management topics have diversified. In order to grasp the problems with urban facilities that have overlapping area s, this study focused on the evaluation of museums and parks. The areas of museums and parks overlap spatially and functionally and heir names are very similar. Originally, conventional museums have the roles of ‘collection', ‘conservation', ‘research', ‘exhibition', ‘education', and ‘pleasure'. On the other side, urban parks have the roles of ‘environmental conservation', ‘recreation', ‘disaster prevention', and ‘landscape planning'. However, both have been attracting more people, so, their roles have overlapped. In this study, problems with overlapping areas of museums and parks were considered by examining the selection procedures for designated management systems by the Tokyo metropolitan government. Consequently, the results show that it is necessary to clarify the role of the facilities, to respect the original roles, to confirm the self-evaluations, and to build partnerships between museums and parks. An approach from museums to parks causes few problems but an approach from parks to museums causes conflicts between conservation and use of resources. Therefore, understanding the priority role, technical device for balancing use with conservation of resources, not maximization of the number of users but optimization, are required to avoid functional confusion between museums and parks. JEL classification: H41, H43, H49