PROBLEM TO BE SOLVED: To provide a compound having an excellent pest control effect.SOLUTION: An ester compound is represented by 4-ethynyl-2,3,5,6-tetrafluorobenzyl(1R)-trans-3-(2-cyano-1-propenyl)-2,2-dimethylcyclopropanecarboxylate (ratio of isomers regarding double bond: Z/E=about 2/1) or 4-ethynyl-2,3,5,6-tetrafluorobenzyl(1R)-trans-3-(1-propenyl)-2,2-dimethylcyclopropanecarboxylate (ratio of isomers regarding double bond: Z/E=about 8/1). A pest control agent and a pest control method use the ester compound.SELECTED DRAWING: None