The main Black Gate (Kuro-mon) that leads into the Ōzone Shimoyashiki where the garden is located.

KUROMON is a 5.4m wide wooden gate with a gable roof. It is a relic from the Owari Tokugawa family residence built in 1900(Year 33 of the Meiji period). 
Along with the continuing tenement house and the fences, it is one of the few remains that escaped the fires of massed air raids of 1945(Year 20 of the Showa period). It is a valuable structure which reflects typical architecture of old samurai residences.