Sankeien Garden was built in Yokohama in the early 20th century by Tomitaro Hara, a successful and wealthy businessman. It is now owned and managed by Sankeien Hoshokai Foundation, attracting nearly 500,000 visitors annually. The garden has been managed as “public garden” as well as “tourist attractions”. The aim of this paper is to investigate the measures for the further development of the two aspects of its management. The former aspect requires still more efforts to increase young visitors including elementary, junior high and high school students. As for the latter, I propose the following three functional requirements: balancing the number of visitors at all seasons, offering handy access information for tourists, and improving attractiveness of the restaurants and cafes in the garden.