It consists of the south building (built in 1888) and the north building (built in 1894), which together were the Shimazus's home and the laboratory when the company was founded, and both are preserved now.
南棟（1888年建設）と北棟（1894年建設）からなり、創業初期に島津の住居・研究所として使われていた建物を保存・公開している。