The aqueous hair cleansing agent of the present invention comprises the following components (A) to (C):(A) an anionic surfactant(B) side chain amino-modified organo polysiloxane having long chain alkyl at both ends represented by the following general formula (1) (R2R32)SiO-(R32SiO)x-(R3R4SiO)y-Si(R2R32) (1)wherein formula (1), R2 represents linear or branched alkyl group having 12 to 30 carbon atoms 12 to C30, R3 represents substituted or non-substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, and R4 represents 3-aminopropyl group or N-(2-aminoethyl)-3-aminopropyl group, and x is an integer number of 1 to 2,000, y is an integer number of 1 to 100, and nitrogen content is 0.31 to 2 mass %(C) a cationic galactomannanand water.
