The present invention is to provide a condensed heterocyclic compound represented by the formula (1), or its N-Oxide, which is effective in pest control and removal and is suitable as an active ingredient of pest control agents. [in the formula, R1 is C1&ndashC4 alkyl, cyclopropyl , or cyclopropyl methyl R2 is C1&ndashC3 alkyl, C1&ndashC3 haloalkyl, OR-6, halogen atom, or hydrogen atom R<3> represents the C1 &ndash C3 alkyl group, halogen atom, or hydrogen atom R4 is C1&ndashC3 alkyl or &ndashS(O)mR7 R5 is C1&ndashC3 alkyl, C1&ndashC3 haloalkyl, -OR8, halogen atom, or hydrogen atom, wherein n is 0,1, or 2].本發明係提供一種式(1)所示之稠合雜環化合物,或其N-氧化物(Oxide),其對於有害生物具有防除效力,且適合作為有害生物防除劑之有效成分,[式中,R1表示C1-C4烷基、環丙基或環丙基甲基,R2表示C1-C3烷基、C1-C3鹵烷基、-OR6、鹵原子或氫原子,R3表示C1-C3烷基、鹵原子或氫原子,R4表示C1-C3鹵烷基或-S(O)mR7,R5表示C1-C3烷基、C1-C3鹵烷基、-OR8、鹵原子或氫原子,n表示0、1或2]。
