An antibacterial soap comprising 2,4,4'-trichloro-2'-hydroxydiphenylether in a range of 0.05 to 5% by weight and at least one organic phosphoric ester represented by the formula, ##STR1## wherein R represents an alkyl group having 8 to 20 carbon atoms, or a group of ##STR2## in which R.sub.1 is an alkyl group having 8 to 20 carbon atoms, R.sub.2 is a hydrogen atom or a methyl group, and n is an integer of 1 to 10; R' represents the same group as R, or a hydrogen atom or an alkali metal; and M represents a hydrogen atom or an alkali metal exerts a wide range of antibacterial activities and marked resistance to discoloration upon exposure to sunlight.