Buaisō (武相荘) is the former home of post-war Japanese bureaucrat Jirō Shirasu and his wife Masako Shirasu, located in Machida, Tokyo, to the west of downtown Tokyo.

His foresight paid off when his Shinjuku house was destroyed in the 1945 bombing of Tokyo.

In the post-war era, he continued to use the house while working with Prime Minister of Japan Shigeru Yoshida in negotiations with the American occupation authorities.

The house was preserved by the city of Machida as a memorial museum to the couple, and is kept as it appeared when they lived there, with items varying according to the seasons.

The house is a wooden structure constructed in the traditional style with a thatched roof, surrounded by Japanese gardens.