The 14,000 tsubo garden is an order of magnitude more expansive than a private garden. Onzan Manor is a tidal style pond-style strolling garden that was created by the late businessman Chojiro Nitta from the early Taisho era to the early Showa era. The garden is surrounded by a thick pine forest, and there is a traditional Japanese-style main house and tea room, where you can spend a relaxing time while looking out at the garden. In 1998, it was designated as a "Registered Tangible Cultural Property" by the Agency for Cultural Affairs, and in 2010, it was registered as a nationally designated scenic spot and important cultural property. Furthermore, in 2011, it was certified as a public interest incorporated foundation by the prefecture.