Provided is a bacteriocin that is capable of being easily mass-produced, has high antimicrobial activity even at low concentration, has a wide antimicrobial spectrum, and is less likely to produce resistant microorganisms. The bacteriocin has the amino acid sequence shown in SEQ ID NO: 1 or SEQ ID NO: 2 in SEQUENCE LISTING, or has the same amino acid sequence as shown in SEQ ID NO: 1 or SEQ ID NO: 2 in SEQUENCE LISTING except that one or several amino acids are deleted, substituted, inserted and/or added, wherein the amino acid sequence provides antimicrobial activity and the isoelectric point is not less than 12.