To provide a novel pesticide. The present invention provides a compound represented by the formula (I) or its salt, and a pesticide containing it as an active ingredient: (I) wherein each of R1 and R2 is a hydrogen atom, a halogen atom, alkyl, haloalkyl, alkoxy, haloalkoxy or cyano, R3 is alkyl or haloalkyl, n is an integer of 0 or 1, and Q is any of the formulae [Q-1] to [Q-6].本發明之課題係提供新穎的有害生物防治劑。本說明之解決手段係提供式(I):[式中,R1及R2係分別為氫原子、鹵原子、烷基、鹵化烷基、烷氧基、鹵化烷氧基或氰基,R3係烷基或鹵化烷基;n係0或1之整數;Q係一般式[Q-1]~[Q-6](參考說明書)]所示之化合物或其鹽,含有此等作為有效成份之有害生物防治劑。
