The invention discloses an ester compound represented by formula (1): wherein R<1> represents hydrogen, fluorine, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkoxymethyl, or C1-C4 alkylthiomethyl; R<3> represents hydrogen or methyl, R<4> represents hydrogen or C1-C4 alkyl, and R<5> represents hydrogen or C1-C4 alkyl. The ester compound has an excellent pest control effect and is therefore useful as an active ingredient of a pest control agent.