Jukei-ni (寿桂尼, d. April 11, 1568) was a Japanese noble lady who acted as the power behind the throne or de facto daimyo of the Imagawa clan during the Sengoku period. She was born in the aristocrat Nakamikado Family of Kyoto. Jukei-ni was the wife of Imagawa Ujichika and mother of Imagawa Ujiteru, Imagawa Yoshimoto and Zukei-ni. She acted as guardian and advisor for Ujichika, Ujiteru, Yoshimoto and her grandson Imagawa Ujizane. Jukei-ni is also known as ''Onna Daimyo'' and "Amamidai", once proclaimed that she would "protect Imagawa to her grave".