This study examined the evolution of the concept and plans related to the development of a recreational port (marina) in Ashiya City, and explored how the original intent of the plan has changed over time. As a result, it became clear that the marina development has been promoted not only for the promotion of marine recreation, but also for various other purposes, such as the promotion of international tourism, improvement of amenities, and business development. It was also found that the significance of marina development has been advocated in each of the international, regional, and local levels. It was concluded that the marina has played a role as a symbol of the International Cultural Residential City. On the other hand, it was pointed out that a common point from the initial planning to the current development was the intention to develop a marina complex that incorporates multi-functions.