Oyakuen was named by Hoshina Masatsune, the 2nd lord of Aizu domain. He used this garden for drug plant husbandry. "Oyaku" literary means a medical herb. The 3rd lord, Masaata, invited Meguro, the famous gardener, and ask him to built Enshu style Japanese garden.

History
1429 founded by Ashia.
1670 the drug plant husbandry was made by Hoshina.
1696 the garden was built by Matsudaira.
1932 registered as great view.

Rakuju-tei and Ochagoden
These houses were used as the hospital of the new government army during Boshin War in 1868. Therefore, they survived from the battle. There are many traces, such as sword-traces.