The invention provides an amorphous alloy with good soft magnetic properties, namely an Fe-based amorphous alloy having excellent soft magnetic properties comprising, in at. %, Fe: 78 to 86%, P: 6 to 20%, C: 2 to 10%, one or both of Si and Al: 0.1 to 5%, and a balance of unavoidable impurities. P or C can as required be partially or totally replaced with B: 1 to 18%.