Abstract: The present invention relates to an antimicrobial agent composition comprising an undiluted mixture solution formed by mixing: 1 to 10 wt % of a mixture comprising 50 to 60 wt % of purified water and chloride in which sodium chloride and calcium chloride which are at a 1:1 ratio are contained; 1 to 2 wt % of a mixture comprising Pueraria lobata root extract and bellflower root extract which are selected from among natural extracts and are at a 1:1 ratio; 5 to 10 wt % of a mixture comprising carbonate based material in which sodium carbonate and sodium bicarbonate which are at a 1:1 ratio are contained; 10 to 15 wt % of a mixture comprising lactic acid and acetic acid among organic acids and their related salts, which are at a 1:1 ratio; and 5 to 10 wt % of chloric acid based compound of inorganic acid.