The present invention is a salt represented by the formula (I) wherein R1 and R2 independently represent a fluorine atom or a C1 to C6 perfluoroalkyl group; L1 represents a C1 to C17 divalent saturated hydrocarbon group, a —CH2— contained in the saturated hydrocarbon group may be replaced by —O— or —CO—; ring W1 represents a C2 to C36 heterocycle; R3 represents a hydrogen atom or a C1 to C12 hydrocarbon group, a —CH2— contained in the hydrocarbon group may be replaced by —O— or —CO—; R4 in each occurrence independently represent a C1 to C6 hydrocarbon group, a —CH2— contained in the hydrocarbon group may be replaced by —O— or —CO—; m represents an integer of 0 to 6; and Z+ represents an organic cation.