Minowa castle is one of the strongest hilltop castle in Kanto region. It was built in 1512 by Nagano clan. Nagano clan ruled around the area of Takasaki and served for Yamanouchi Uesugi clan. When Takeda Shingen, one of the strongest Daimyo during the Sengoku era, invaded Kanto region, Nagano and this castle defeated Shingen many times.

Minowa castle was fallen in 1566 and abandoned in 1598 when Ii Naomasa, the load of the castle at that time, moved to Takasaki Castle.

The main feature of this castle is the huge dry moat. It is 30m wide and 10m deep.