Built in: 1560
Record said, it was built by Yamamoto Kansuke for the protection of Kawanakajima area. Therefore, this castle contains lots of Koshu style face, and considered as one of Takeda's Castle. After the fall of Takeda clan, It becomes Oda's castle. However, when Nobunaga was killed at Honnoji in 1582, Uesugi Kagekatsu take over the entire Shinano area. But Hideyoshi ordered Kagekatsu move to Aizu. After the battle of Sekigahara, Sanada Nobuyuki, the brother of Yukimura, moved here in 1622.
This gate is the biggest gate in Hon-maru and was used for security. It was faithfully rebuilt using the original cornerstones.