A novel pesticide is provided. The present invention provides a compound represented by the formula (I) or its salt: wherein Q is phenyl or pyridyl which may be substituted W is an oxygen atom or S(O)m each of A1 to A5 is -C(R5)= or a nitrogen atom, provided that among A1 to A5, the number of groups which may be nitrogen atoms, is from 0 to 2 each of B1 to B4 is a hydrogen atom, a halogen atom, alkyl or haloalkyl each of R1 and R2 is a hydrogen atom, a halogen atom, alkyl, haloalkyl, alkoxy, haloalkoxy or cyano and R3 is alkyl or haloalkyl.本發明係提供一種新穎的有害生物防治劑。本發明係提供一種式(I)所示之化合物或其鹽,〔式中,Q係可取代之苯基或可取代之吡啶基;W係氧原子或S(O)m;A1~A5係-C(R5)=或氮原子,且A1~A5可為氮原子的數目為0~2個;B1~B4可各自相同或相異,係氫原子、鹵素原子、烷基或鹵烷基;R1及R2各自係氫原子、鹵素原子、烷基、鹵烷基、烷氧基、鹵烷氧基或氰基;R3係烷基或鹵烷基〕。
