Disclosed is a peptide having high safety and an excellent antibacterial activity or a salt of the peptide. Specifically disclosed is a peptide selected from the following peptides (1) and (2) or a salt of the peptide. (1) A peptide comprising an amino acid sequence represented by the general formula (I). (Pro Hyp Gly)<；SUB>；n<；/SUB>；-[(Lys x Gly)<；SUB>；m<；/SUB>；-(Pro Hyp Gly)<；SUB>；l<；/SUB>；-(Lys X Gly)<；SUB>；p<；/SUB>；]<；SUB>；a<；/SUB>；- (Pro Hyp Gly)<；SUB>；r<；/SUB>； (I) [wherein n represents an integer of 1 to 6； m represents an integer of 1 to 4； l represents an integer of 0 to 7； p represents an integer of 1 to 4； r represents an integer of 1 to 6； a represents an integer of 1 to 6； and X represents an amino acid residue selected from Ile, Leu and Hyp, provided that the (m+p) pieces of X's may be the same as or different from each other, n+m+l+p+r = 4 to 15, m+p=2 when l=0, and m=1, l=0 and p=1 when a=2.] (2) A peptide which comprises an amino acid sequence having the substitution, deletion or addition of 1 to 3 amino acid residues other than Lys, Gly and X in the amino acid sequence represented by the general formula (I), and which has an antibacterial activity.
