Provided is a surfactant composition capable of ensuring high fluidity and excellent storage stability while containing a high amount of an internal olefin sulfonate having 16 or more and 18 or less carbon atoms.The present invention relates to a surfactant composition comprising the following components (A), (B), and (C):(A) 63.0% by mass or more and 70.0% by mass or less of an internal olefin sulfonate having 16 or more and 18 or less carbon atoms,(B) 0.2% by mass or more and 1.8% by mass or less of an amphoteric surfactant, and(C) water,in which the total content of the component (A) and the component (B) is 64.0% by mass or more and 70.8% by mass or less.
