Provided is a detergent composition having components (A) and (B.sub.1): (A) a phosphate monoester (1), and (B.sub.1) a phosphate monoester (2), wherein n=1; components (A), (B.sub.1) and (B.sub.2): (A) a phosphate monoester (1), (B.sub.1) a phosphate monoester (2), wherein n=1, and (B.sub.2) a phosphate monoester (2), wherein n=2; components (A), (B.sub.1) and (B.sub.2): (A) a phosphate monoester (1), (B.sub.1) a phosphate monoester (2), wherein n=1, and (B.sub.2) a phosphate monoester (2), wherein n=2; components (A) and (C): (A) a phosphate monoester (1), and (C) a phosphate monoester (3); or a phosphate-based surfactant produced by reacting a compound obtained by adding to an alcohol an alkylene oxide of 2 to 4 carbon atoms, with phosphoric acid, a polyphosphoric acid or P.sub.2O.sub.5: ##STR00001## The detergent composition is mild to the skin, is high in versatility, and has a good foaming property in weak acidic water or in hard water.