細井家資料館, Former family museum in Minamiaizu, Fukushima Prefecture, Japan

The Hosoi Family Museum occupied a former kura storehouse of the Hosoi family in Shizukawa, Minamiaizu, Fukushima Prefecture. Its displays gathered lacquerware made between 1745 and the Meiji era, about 207 postal documents, and relics of the Zen master Nyokatsu. The family's 1861 thatched main house and seven other buildings are registered national tangible cultural properties.

The Hosoi family served as village headmen (nanushi) in the late Edo period while running sake brewing, lacquerware and money-lending businesses. In September 1872, the year the national postal system began, they opened a post office handling point on the site. The museum occupied the family's former storehouse; its postal materials were donated to Minamiaizu Town in 2011 and are now shown in a permanent Hosoi family corner at the town-run Oku-Aizu Museum.

The Hosoi family served as village headmen (nanushi) in the late Edo period while running sake brewing, lacquerware and moneylending. Their lacquer collection spans pieces said to date from 1745 to the Meiji era, including a seven-piece set of cups with a crane design, the only one kept in the Tajima area. The family opened a post office in 1872, and 207 postal documents were designated a town cultural property in 1983.

The museum stood in the Shizukawa district of Minamiaizu, Fukushima Prefecture, a 15-minute drive or bus ride from Aizu-Tajima Station, with the Shizukawa bus stop a minute's walk away. Before closing it opened from early April to mid-November, 10:00 to 16:00, with irregular closing days.

The Hosoi family ran the post office from 1872; 207 postal documents were designated a town important tangible folk cultural property in 1983. After the museum closed in 2011 they were donated to Minamiaizu Town and are shown in a permanent Hosoi family corner at the town-run Oku-Aizu Museum.