Asurfactant mixture composition comprising: (A) a sulfonic acid salt of a lower alkyl ester of a C e to C22 saturated fatty acid; and (B) a sulfonic acid salt of a lower alkyl ester of a C B to C 22 unsaturated fatty acid, wherein the weight ratio (A/B) of the component (A) to the component (B) is 95/5 to 5/95. This surfactant mixture composition has the improved rinsing properties without decreasing the detergency characteristics.