PROBLEM TO BE SOLVED: To provide a shampoo with hair straightening (curly hair correction) function comprising a high concentration of an aqueous solution of an amino acid-based anionic surfactant TEA-cocoyl glutamate, which, by straightening hair by combing with a comb or hands when shampooing with the shampoo, can simply straighten curly hair.SOLUTION: A shampoo with hair straightening function comprises a high concentration of 40.0 weight% to 60.0 weight% of a 30% aqueous solution of the amino acid-based anionic surfactant TEA-cocoyl glutamate.SELECTED DRAWING: None