at a low temperature (5 ) during the foaming of the fluid or dilution after long-term storage and provides excellent surfactant composition. The following ingredients (A), (B) and (C) and the content of component (A) in the surfactant composition of the content of 40 to 75% by weight. (A): a sulfate surfactant represented by the general formula (1) R 1 O-(PO) m (EO) n SO 3 M (1) (Wherein, R 1 is a hydrocarbon group of a carbon number of 8 ~ 18, PO is an propylene oxide, EO represents an ethyleneoxy, m, n is the average addition number of moles a represents, the same or different, 0
