<；P>；PROBLEM TO BE SOLVED: To provide a material having a chemical structure different from a well-known antibacterial material, and antibacterial activities, and exhibiting excellent antibacterial activities selective according to kinds of bacteria. <；P>；SOLUTION: The antibacterial agent contains a compound represented by formula I (wherein, R<；SB>；1<；/SB>；is a linear hydrocarbon) or a salt thereof, and a compound represented by formula (II) (wherein, R<；SB>；2<；/SB>；is a 1-6C linear or branched alkyl group, a 1-6C alkylthioalkyl group or a phenyl group) or a salt thereof as active ingredients. <；P>；COPYRIGHT: (C)2007,JPO&INPIT
