Matsumoto Castle
was the 3rd Matsudaira "daimyō" of Matsumoto Domain and 8th hereditary chieftain of the Toda-Matsudaira clan. Mitsuyasu was the eldest son of Matsudaira Mitsuo and was born at Matsumoto Castle. He became "daimyō" on his father's death in 1756; however, he died in 1759 at the clan's Gofukubashi residence in Edo at the age of 23. His wife was a daughter of Abe Michichika of Oshi Domain.