An organic nonlinear optical material which is an optically transparent solid solution comprising (a) an organic compound component exhibiting nonlinear optical response represented by formula (I): ##STR1## wherein Z.sup.1 represents an atomic group, which together with the adjacent carbon atom, forms a substituted or unsubstituted 5- to 6-membered aromatic ring having at least one nitro group as a substituent; and Z.sup.2 represents an atomic group, which together with the adjacent nitrogen atom, forms a substituted or unsubstituted pyrrole, imidazole, pyrazole, triazole or tetrazole ring, and (b) a polymer. The nonlinear optical material exhibits high nonlinear optical response and excellent transmission to blue light.