Polypeptides and their antimicrobial or disinfecting applications

Antimicrobial agent containing as a novel polypeptide and an active ingredient which has a summary excellent antibacterial activity, antifungal agents or disinfectants have been disclosed. Polypeptides of the present invention, the amino acid sequence represented by any one of 31 to 12 and 13 to not SEQ ID NO: 1. The antibacterial agent, antifungal agent or disinfectant, burns, bedsores, wounds, skin ulcers, leg ulcers, diabetic ulcers, occlusive arterial disease and peripheral arterial disease, cellulitis, acute lymphangitis, lymphadenitis , erysipelas, skin abscesses, necrotizing subcutaneous infection, staphylococcal scalded skin syndrome (SSSS), folliculitis, furuncle (Mencho), Hidradenitis suppurativa, carbuncles (carbuncle), infectious paronychia, erythrasma and prevention of severe infection (sepsis) diseases such as is effective in improving or treating.