SURFACTANT COMPOSITION

The present invention relates to a surfactant composition capable of improving the retention of a liquid oil on a solid surface, said surfactant composition comprising an anionic surfactant (A), a cationic surfactant (B), a liquid oil (C) and water, wherein the water constitutes a continuous phase, the molar ratio RA is 0.25-0.60, and the molar ratio Rb is 0.6 or greater. RA: The molar ratio {(A)/[(A)+(B)]} of the amount of the anionic surfactant (A) relative to the total amount of the anionic surfactant (A) and the cationic surfactant (B). Rb: The molar ratio {[(a1)+(b1)]/[(A)+(B)]} of the total amount of a branched anionic surfactant (a1) and a branched cationic surfactant (b1) relative to the total amount of the anionic surfactant (A) and the cationic surfactant (B). 本发明涉及一种可使液体油高浓度残留于固体表面上的表面活性剂组合物，其含有阴离子表面活性剂(A)、阳离子表面活性剂(B)、液体油(C)、及水，且使水成为连续相，下述摩尔比RA为0.25～0.60，下述摩尔比Rb为0.6以上。RA：阴离子表面活性剂(A)的量相对于阴离子表面活性剂(A)与阳离子表面活性剂(B)的合计量的摩尔比{(A)/[(A)+(B)]}，Rb：分支型阴离子表面活性剂(a1)与分支型阳离子表面活性剂(b1)的合计量相对于阴离子表面活性剂(A)与阳离子表面活性剂(B)的合