Hamamatsu Domain
On the death of his brother-in-law, Matsudaira Suketoshi, the "daimyō" of Hamamatsu Domain in Tōtōmi Province in 1773, Sukekuni was adopted into the Honjō branch of the Matsudaira clan and inherited the 70,000 "koku" domain. In 1729, he was transferred to Yoshida Domain in Mikawa Province. In 1741, he became a "Sōshaban" (Master of Ceremonies) in the administration of Edo Castle. In 1748, his Court Rank was raised to Lower 4th. In 1749, he was appointed "Kyoto Shoshidai," at which time he exchanged Yoshida Domain back for Hamamatsu Domain. The same year, his courtesy title was upgraded to Chamberlain. He died in 1752.