Eldest son and heir of Shibata Tsunasada, brother of Shibata Shigeie, vassal of Uesugi Kenshin, and master of Shibata Castle.

Nagaatsu excelled in diplomacy and was one of Kenshin's Seven Generals. He supported Uesugi Kagekatsu in the Otate no Ran after Kenshin's death and demonstrated his diplomatic finesse in the peace negotiations with Takeda Katsuyori. He died of illness after the war.