A compound represented by formula (1) and an N-oxide thereof have excellent pest control effect. (In the formula, Het to which R1—S(O)n is bonded represents a five-membered aromatic heterocyclic ring represented by formula H1, H2, H3 or H4 (wherein Y1 represents an oxygen atom or the like; Y2 represents an oxygen atom or the like; G1, G2 and G3 may be the same or different and each represents a nitrogen atom or the like; R1 represents a C1-C6 alkyl group which may have one or more atoms or groups selected from the group X, or the like; and n represents 0, 1 or 2); A1 represents an oxygen atom or the like; A2 represents a nitrogen atom or the like; A3 represents a nitrogen atom or the like; and R2 and R3 may be the same or different and each represents a C1-C6 chain hydrocarbon group which may have one or more atoms or groups selected from the group X, or the like.)