PROBLEM TO BE SOLVED: To provide an aqueous hair cleansing agent that is excellent in foaming property, shows a smooth foam quality and good slidability of finger-combing when rinsing the hair, is less irritating to the scalp and suppresses itching of the scalp.SOLUTION: The aqueous hair cleansing agent includes water and components (A) and (B) described below in a weight ratio (B)/((A)+(B)) of from 1/100 to 25/100: (A) a sulfate-based anionic surfactant having a specific structure (B) a polyoxyethylene alkyl ether-based nonionic surfactant having a specific structure.COPYRIGHT: (C)2011,JPO&INPIT【課題】泡立ちに優れ、滑らかな泡質とすべりの良いすすぎ時指通り性を有するとともに、頭皮に対してマイルドであり、頭皮のかゆみを抑制した水性毛髪洗浄剤を提供する。【解決手段】次の成分(A)、(B):(A)特定の構造を有する硫酸塩型アニオン界面活性剤、(B)特定の構造を有するポリオキシエチレンアルキルエーテル型ノニオン界面活性剤、及び水を含有し、(B)/((A)+(B))の質量割合が1/100~25/100である水性毛髪洗浄剤。【選択図】なし