Obama Domain
was the 11th "daimyō" of the Obama Domain. He was the younger son of Sakai Tadatsura, but because of his youth at the time of his father's death, his uncle Sakai Takayuki from the Tsuruga Domain was made "daimyō" instead. The succession reverted to Tadayori on Takayuki's death in 1828. He inherited a domain with over 300,000 "ryō" in debt. Through fiscal reforms he was initially able to reduce this by 100,000 "ryō", but the domain economy collapsed in 1833 due to crop failures. He resigned his office in 1834. His wife was a daughter of Matsudaira Sadakuni of the Iyo-Matsuyama Domain.