Provided is a compound having an excellent noxious organism control effect. An ester compound represented by general formula [chemical formula 1] (I) [wherein R1 represents a hydrogen atom or a methyl group； R2 represents a methyl group when R1 represents a methyl group, or R2 represents a group represented by general formula [chemical formula 2] (II) (wherein X and Y may be the same as or different from each other and independently represent a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkocycarbonyl group having 2 to 5 carbon atoms, or a haloalkyl group having 1 to 4 carbon atoms) when R1 represents a hydrogen atom； R3 represents a hydrogen atom, a trifluoromethyl group, a methyl group, a methoxy group, a methoxymethyl group, an allyl group, an ethynyl group or a propargyl group； and R5 represents an alkyl group having 1 to 4 carbon atoms when R4 represents a fluorine atom, or R5 represents the same substituent as R4 when R4 represents an alkyl group having 1 to 4 carbon atoms]； and a noxious organism control agent and a noxious organism control method, each using the ester compound.提供一種具有優良的有害生物防除效力的化合物。 一種酯化合物及使用該酯化合物之有害生物防除劑及有害生物防除方法，以下列的通式[化1](I)表示： [化1][式中R1是表示氫原子或甲基，R1表示甲基時R2也表示甲基，而且R1表示氫原子時R2為以下列通式[化2](II) [化2](此處X及Y為同一或不同，表示氫原子、鹵素原子、氰基、碳數1~4的烷基、碳數2~5的烷氧基羰基或碳數1~4的鹵烷基)表示的基，R3是表示氫原子、三氟甲基、甲基、甲氧基、甲氧基甲基、烯丙基、乙炔基或丙炔基，R4表示氟原子時R5表示碳數1~4的烷基，或者R4表示碳數1~4的烷基時R5表示與R4同一的取代基]。
