To obtain an excellent insecticidal composition by combining specific insecticidal nitro compound with one of acephate, cartap, thiocyclam, propoxur, BPMC, chloropyrifos methyl or ethofenprox. A nitro compound expressed by the formula [R<1> is H or 1-4C alkyl; R<2> is -S-R<3> or -N(R<4>)R<5> (R<3> is alkyl; R<4> and R<5> are H or alkyl); Y is CH or N] [e.g. 1-(2-chloro-5-pyridylmethylamino)-1-methylthio-2-nitroethylene] and at least one selected from the group such as O,S-dimethyl acetylphosphoroamide thioate (acephate), S,S'-[2-(dimethylamino) trimethylene] bis(thiocarbamate) (cartap) and N,N-dimethyl-1,2,3-trithian-5-ilamine (thiocyclam) are contained the aimed insecticidal composition. The insecticidal composition exhibits co-operative and synergistic effect in a low concentration. |