The invention relates to an aqueous hair cleansing agent comprising the following components (A), (B), (C), and water and having a pH of 2 to 5 at 25° C. when diluted 20-fold by mass with water:(A) an internal olefin sulfonate,(B) an organic solvent selected from the group consisting of the following (B1) to (B5):(B1) an aromatic alcohol,(B2) a polypropylene glycol,(B3) a N-alkyl pyrrolidone,(B4) an alkylene carbonate,(B5) a lactone or a cyclic ketone, and(C) an organic carboxylic acid selected from the group consisting of a hydroxymonocarboxylic acid and dicarboxylic acid.
