This fused heterocyclic compound represented in formula (1) has excellent effectiveness in pest control.In the formula, A1 represents —NR4—, etc. A2 represents a nitrogen atom, etc. R1 represents an ethyl group, a cyclopropyl group, or a cyclopropylmethyl group R2 represents —S(O)mR6 or —C(R7)(CF3)2 R4 represents a C1-C6 alkyl group optionally having one or more halogen atoms R6 represents a C1-C6 haloalkyl group R7 represents a fluorine atom or a chlorine atom, and m and n each represents 0, 1 or 2.
