The Kumagai family was the most powerful family of merchants based in Iwami Ginzan Silver Mine. It was involved in the management of the Omori Silver Mine, financial activities, sake brewing, as well as management of magistrate finances and lodging, in addition to being a purveyor. The residence, built in 1801, is open to the public and contains exhibits of household articles that change with each season to introduce visitors to the trading activities and daily life at the time.