An ether compound represented by the following formula and its use:; wherein n represents 0 or 1, m represents an integer of 0 to 2, Y represents —O—, —S—, —C(═O)—O—, and —O—C(═O)—, X1 and X2 represent a hydrogen atom or a fluorine atom, and R represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms and substituted with one or more fluorine atoms, with a proviso that, when m is 0, R has 3 to 20 carbon atoms. R may have in the bond thereof intervening oxygen atom, sulfur atom, and carbonyl group.展开▼