Sadamun was a Japanese swordsmith in the Nambokucho Period. His common name was Hikoshiro. He was a master swordsmith, next only to Masamune in fame. Sadamune had three distinguished disciples - Motoshige (Bizen Osafune), Nobukuni (Yamashiro) and Kunimitsu (Tajima Hojoji).
Sadamun was born in 1340, Omi Province (Shiga Prefecture), Japan.