A dye-forming coupler and compound of formula (I): ##STR00001## wherein Q represents a residue that forms, together with --N--C.dbd.N--, a nitrogen-containing 6-membered ring; R.sub.A represents an aryl, heterocyclic, or --(R.sub.1).sub.r--(R.sub.4).sub.m group; X represents an aryl group; Y represents a hydrogen atom, or a group capable of being split-off upon a coupling reaction with an oxidized product of a developing agent: wherein, when R.sub.A represents an --(R.sub.1).sub.r--(R.sub.4).sub.m group, R.sub.1 represents a methylene group, a methine group, or a carbon atom; r is 1 to 30; R.sub.4 represents a substituent except for a hydrogen atom; m is 1 to 30; and the --(R.sub.1).sub.r--(R.sub.4).sub.m group does not represent a straight-chain alkyl group.