A pesticidal composition comprising an oxadiazine compound given by formula (A): ##STR00001## and an ester compound given by formula (B): ##STR00002## as active ingredients, wherein the weight ratio of the oxadiazine compound given by formula (A) to the ester compound given by formula (B) is within the range of 50:1 to 1:10, has an excellent efficacy for controlling pests.