The simple square building with a pyramidal thatched roof features on the inside a bamboo ceiling that looks like the underside of Chinese umbrella - from which it gets its name 'Kasa-tei' (lit. Umbrealla Pavillion).
宝形造茅葺きの素朴な建物で、内部の天井が竹で組まれ、その形が唐傘に似ている所から傘亭の名がある。