The present invention relates to a surfactant composition containing a cationic surfactant (hereinafter referred to as a compound (A)), one or more compounds (hereinafter referred to as a compound (B)) selected from anionic aromatic compounds and bromide compounds and a cationic polymer (C), wherein compound (A) and (B) are selected when meeting the following condition: a combination of the compounds (A) and (B) ensures that that the viscosity (20.degree. C.) of a solution prepared by mixing an aqueous solution S A of the compound (A) and an aqueous solution SB of the compound (B) in the same ratio is at least two times the viscosity of any one of the aqueous solutions (20.degree. C.) before being mixed.