The present invention provides a surfactant composition containing (a) 40 to 58% by mass of specific polyoxyalkylene alkyl ether sulfate ester salt having a structure formed by addition of propylene oxide, (b) 13 to 20% by mass of alcohol having 1 to 6 carbon atoms, (c) 0 . 002 to 0 . 5% by mass of alkaline agent, and water.