A fluorine-containing ester compound of an unsaturated carboxylic acid represented by the formula in which R1 is a hydrogen atom, a fluorine atom, an alkyl group having 1 to 4 carbon atoms or a fluoroalkyl group having 1 to 4 carbon atoms, R2 is a trifluoroalkyl group having 1 to 4 carbon atoms, R3 is a non-aromatic polycyclic hydrocarbon group and R4 is a hydrogen atom, a fluorine atom, an alkyl