An electrostatic image-developing toner comprising at least a resin and a colorant, which contains at least one member selected from the group consisting of compounds of the following formulas (I) and (II): ##STR1## wherein each of R1, R2, Ar1 and Ar2 is a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aralkyl group, and A is (B) (SO3.sup.???)2 or MX6 2???, wherein B i