PURPOSE: To provide an azo pigment composition that exhibits good transparency, gloss, and coloring power in an aqueous ink system comprising a monoazo or diazo pigment and a specified alkyl polyglucoside.

CONSTITUTION: In the presence of 1-10 wt.% of an alkyl polyglucoside of the formula (wherein, X is 1-2; n is 8-18, M is O, S, P, Si), a diazotized amine is coupled with a coupling component comprising (un)substituted aryl iodie, naphthol, or pyrazolone to obtain the composition containing an azo pigment selected from among monoazo pigments and diazo pigments and 1-10 wt.% of a compound of the formula. Practically, for example, 2,4-dinitroaniline is used as the diazotized amine and 2-naphthaol is used as the coupling component to obtain the intended composition containing CI-Pigment Orange 5.