To prepare an antimicrobial agent composition exhibiting the antimicrobial effect in a small amount without causing the lowering in the strength of a resin, etc., and further to prepare a cosmetic safe for human bodies and high in the antimicrobial effect.
An antimicrobial agent composition contains a fatty acid silver salt expressed by the formula: RCOOAg (R is a linear or branched alkyl, alkenyl or alkynyl) having good dispersibility in lipophilic components, and a cosmetic contains the fatty acid silver salt. The fatty acid silver salt is known to have exhibited the antimicrobial effect in a low concentration of approximately 0.001-1.0wt.%. The effect is remarkable, when the carbon number in the fatty acid residue of the fatty acid silver salt is 7-23.
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