A composition including an artificially synthesized antimicrobial peptide that is not present as a mature peptide in nature. The composition includes an artificially synthesized peptide that has an antimicrobial activity against at least one strain of bacteria or fungi and includes an amino acid sequence represented by any one of SEQ ID NOs: 1 to 6 or an amino acid sequence formed by substituting, deleting and/or adding one, two or three amino acid residues in/from/to the amino acid sequence, and further including at least one species of pharmaceutically acceptable carrier.
