A fused heterocyclic compound of formula (1): wherein, A1 and A2 represent a nitrogen atom or the like, R1, R2, R3 and R4 represent a halogen atom or the like, R2 and R3 represent a halogen atom or the like, R5 represents a C1-C6 chain hydrocarbon group optionally substituted with one or more halogen atoms, or the like, R6 and R7 represent a C1-C4 chain hydrocarbon group substituted with one or more halogen atoms, or the like, and n represents 0 or 1,has an excellent noxious arthropod controlling effect.
