Also known as: 宮千代丸、松三、孝長

Son (or possibly younger brother) of Sanbonji Sadanaga, he became head of the Sanbonji Clan and master of Fudousan Castle after Uesugi Kagekatsu become head of the Uesugi Clan. He committed suicide in the Battle of Uozu Castle along with twelve other Uesugi commanders. He was apparently still a young man at the time.