To obtain a cleansing agent composition having low stimulation and excellent frothing property, quickly eliminating the foam, giving good feeling during and after cleaning and especially suitable as a liquid cleansing agent for body.

This composition contains (A) an N-acylamino acid, an N-acyl- N-alkylamino acid or their salts (excluding the component B) and (B) a glycine derivative of the formula (R1 is a 5-21C alkyl, an alkenyl or a hydroxyalkyl) (or its salt such as an alkali metal salt, a trialkanolamine salt or a basic amino acid salt) at a weight ratio (A:B) of 50:1 to 1:50 and a total amount (A+B) of 5-90wt.%. An example of the component A is a secondary amide-typeN- acylamino acid salt of the formula R2CONH(CH2)mCOOM1 (R2CO is a 10-16C straight-chain acyl; (m) is 1 or 2; M1 is an alkali metal, an alkanolamine or a basic amino acid).