An
antimicrobial agent includes silver-chloro complex salts and
chloride, and further oxidizing agents such as
sodium hypochlorite or
sodium chlorite. As a result, it is possible to provide the
antimicrobial agent having immediate and residual disinfecting and
antimicrobial effects on
bacteria and molds of a wide variety of species and capable of demonstrating instantaneous deodorizing effect. The antimicrobial agent includes the silver-chloro complex salts and
chloride, and further a compound, for example, such as alcohols or surfactants, which has compatibility with a
solvent such as water which dissolves the
chloride. As a result, it is possible to provide the antimicrobial agent which can be used conveniently at the stored concentration, and which has immediate effect and cleansing ability without causing
rust or deposition of salts in use. Further, the antimicrobial agent includes the silver-chloro complex salts, and chloride, for example, such as
polyaluminium chloride or
benzalkonium chloride, which has at least (I) a property capable of existing as a supersaturated
aqueous solution in the presence of a
crystal nucleus at least at
room temperature for 24 hours or longer and (II) a property capable of being decomposed when dissolved in water.