Provided are an oxaziridine compound showing an antifungal activity and cytotoxicity and expected as a new antifungal agent or anticancer agent, and a production method thereof. A compound represented by the formula 1: wherein X is a single bond, -C(H)(R 6 )- or -C(H)(R 7 )-C(H)(R 8 )-; and R 1 - R 8 are each independently a hydrogen atom, an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group, or a salt thereof.