Kinowaki Sukesada served as a bushō during the Sengoku and Azuchi-Momoyama periods. He was a retainer of the Shimazu clan of Satsuma Province.
The Kinowaki were members of the Hyūga-Itō clan, and Sukesada was a lineal descendant of Kinowaki Sukeyori, a member of the Itō clan and founder of the Kinowaki family from the thirteenth century. Around the time of Sukesada’s father, Kinowaki Suketoshi, the clan separated from the Itō and entered into the service of Shimazu Takahisa, the fifteenth head of the Shimazu clan, becoming retainers of the Shimazu. Sukesada also served Takahisa but, later, upon orders from his lord, served as a guardian of Shimazu Toshihisa. In the fourth month of 1557, he achieved meritorious results in a battle against the Hishikari clan, taking the head of an enemy commander with the helmet affixed.
In the sixth month of 1586, when Toshihisa’s son-in-law, Shimazu Tadachika, achieved his first experience in battle during an attack against Tsukushi Hirokado, Sukesada, along with Tōya Yoshikata, supported him and participated in an assault on Takatori Castle.
During the assault on Takatori Castle, there is a story that Sukesada put water in an earthenware teapot, attached it to his lance, and walked about. After passing-by a burning mountain, Tadachika’s face was blackened by the smoke, so one of Tadachika’s retainers named Wakimoto Jō-no-suke requested the water from Sukesada to wash Tadachika’s face.