A COMPOSITION COMPRISING A CARBOXAMIDE COMPOUND REPRESENTED BY FOLLOWING FORMULA (1), WHEREIN R1 REPRESENTS A HYDROGEN ATOM OR A METHYL GROUP, AND R2 REPRESENTS A METHYL GROUP, A DIFLUOROMETHYL GROUP OR A TRIFLUOROMETHYLGROUP, AND ONE OR MORE NEONICOTINOID COMPOUND SELECTED FROM GROUP (A) CONSISTING OF ACETAMIPRID, CLOTHIANIDIN, DINOTEFURAN, IMIDACLOPRID, NITENPYRAMTHIACLOPRID AND THIAMETHOXAM POSSESSES AN EXCELLENT PESTICIDAL EFFECT.