Provided is a pest control composition that contains, as active ingredients, at least one type of pest control agent selected from the group (a) consisting of an iminopyridine derivative represented by general formula (1) and an acid addition salt thereof, and at least one type of pest control agent selected from the group (b) consisting of pest control agents other than those in group (a). [Chemical formula 1] [In formula (1): Ar represents a halogen atom, a C1-C4 alkyl group that may be optionally substituted by a halogen atom, an alkyloxy group that may be optionally substituted by a halogen atom, or a pyridyl group or pyrimidyl group that may be optionally substituted by a hydroxyl group, cyano group, or nitro group； R1 represents a hydrogen atom or a C1-C6 alkyl group； Y represents a hydrogen atom, a halogen atom, a hydroxyl group, a C1-C6 alkyl group that may be optionally substituted by a halogen atom, a C1-C6 alkyloxy group that may be optionally substituted by a halogen atom, a cyano group, a formyl group, or a nitro group； and R2 represents a C1-C6 alkyl group that is substituted by a halogen atom.].本發明係一種有害生物防除用組成物，其係將含有選自由下述一般式(1)表示之亞胺吡啶衍生物及其酸加成鹽所構成之(a)群組中之至少一種的有害生物防除劑、及選自由前述(a)群組以外之有害生物防除劑所構成之(b)群組中之至少一種的有害生物防除劑作為有效成分。[式(1)中，Ar係表示鹵素原子、可被鹵素原子取代之C1~C4烷基、可被鹵素原子取代之烷氧基、羥基、氰基、或可被硝基取代之吡啶基或嘧啶基；R1係表示氫原子或C1~C6烷基；Y係表示氫原子、鹵素原子、羥基、可被鹵素原子取代之C1~C6烷基、可被鹵素原子取代之C1~C6烷氧基、氰基、甲醯基、或硝基；且R2係表示被鹵素原子取代之C1~C6烷基]。
