Abstract: The present invention provides a cleanser composition having a high foaming ability with a low stimulus to the skin. The cleanser composition of the present invention is weakly acidic and comprises (a) a phosphate monoester represented by the general formula (1) and (b) a phosphate diester represented by the general formula (2) wherein the ratio of the component (a) to the component (b), i.e. the (a)/(b) ratio, is from 65/35 to 90/10 by weight: wherein R1 represents an alkyl or alkenyl group containing 9 to 15 carbon atoms on average with a branching degree of 10% or more, X1 and X2 and X3 each represent a hydrogen atom or an alkali metal, and n is a number of 0 to 5.