The structure dates to the Edo period. It was originally located at Komuro Castle (小室城) in Ōmi Province, present Nagahama, Shiga. It was designed by the tea master Kobori Enshū (1579-1647). It was relocated to Sapporo in 1919. In 1989 a surrounding garden was created by Kobori Sokei, a tea master and a 12th generation descendant of Kobori Enshū.
Media related to Hassō-an at Wikimedia Commons