Tanaka Domain
was the 3rd Honda "daimyō" of Tanaka Domain. Masatomo was born in Edo as the second son of Honda Masayoshi, and became heir on the death of his eldest brother in 1757. He was presented in formal audience to the Shōgun in 1761, and received the courtesy title of "Kii-no-kami". He became "daimyō" on his father's retirement in 1773. Although he encouraged the development of martial arts within the domain, he died after a short tenure in 1777. His grave is at the temple of Tokuhon-ji in Asakusa, Tokyo. He did not have a formal wife.