In crop production in the fields of agriculture, horticulture and the like, the damage caused by insect pests etc. is still immense, and insect pests resistant to existing insecticides have emerged. Under such circumstances, the development of novel agricultural and horticultural insecticides is desired. The present invention provides an amide compound represented by the general formula (I): (wherein A1, A2 and A3 each represent a nitrogen atom or a CH group, R1 represents an alkyl group, R2 and R4 each represent a haloalkyl groups, R3 represents an alkyl group, and m represents 0, 1 or 2) or a salt thereof; an agricultural and horticultural insecticide and microbicide comprising the compound or a salt thereof as an active ingredient; and a method for using the insecticide and microbicide.