was the 7th "daimyō" of Sabae Domain and 8th hereditary chieftain of the Manabe clan. His courtesy title was "Shimōsa-no-kami", and his Court rank was Junior Fifth Rank, Lower Grade, later raised to Junior Fourth Rank, Lower Grade. He was the fifth son of Manabe Akihiro, became "daimyō" on his uncle's death in 1814. Under Shōgun Tokugawa Ieharu he served in a variety of positions in the Tokugawa shogunate, including "Sōshaban", "Jisha-bugyō", "Osaka jōdai", "Kyoto Shoshidai" and "rōjū". In 1858, Ii Naosuke was appointed "Tairō", and Manabe was seen as his right-hand man, taking a leading role in the ratification of the Harris Treaty opening Japan to the Western powers. This drew the wrath of the "Sonnō jōi" samurai, and Yoshida Shōin in particular pushed strongly for Manabe's assassination. After the assassination of IInaosuke and accession of Shōgun Tokugawa Yoshinobu, Akikatsu quickly fell from favour. He was dismissed as "rōjū" and told to retire in 1862, and Sabae Domain was reduced in "kokudaka" by 10,000 "koku". He remained under house arrest to 1865. He was placed under house arrest again by the new Meiji government for suspicion of collaboration with Aizu Domain from 1868 to 1869. He died in 1884. His wife was a daughter of Matsudaira Yasutō of Hamada Domain.