A dye-forming coupler of formula (I), a silver halide photographic light-sensitive material containing the coupler, and an azomethine dye compound derived from the coupler: ##STR00001## wherein Q is a residue that forms, together with the --N--C.dbd.N-- moiety, a nitrogen-containing 6-membered ring; R.sub.A is a certain alkyl group having at least 7 carbon atoms, or -L-R.sub.1; X is an aryl group; Y is a hydrogen atom, or a group capable of being split-off upon a coupling reaction; wherein, when R.sub.A is -L-R.sub.1, L is a divalent linking group, and R.sub.1 is a substituent; and -L-R.sub.1 does not represent an alkyl, alkenyl, alkynyl, or aryl group, and -L-R.sub.1 does not represent a heterocyclic group that bonds, with a carbon atom therein, to the nitrogen atom of the nitrogen-containing 6-membered ring formed by Q and the --N--C.dbd.N-- moiety.