Disclosed is an additive for a nonaqueous
electrolyte solution, containing a first compound represented by Formula (1) and a second compound which is a
carbonate compound, a cyclic
sulfone compound, and / or a cyclic disulfonic acid ester compound. [In Formula (1), Q represents an alkenylene group having 4 to 8 carbon atoms, which forms a cyclic group together with a
sulfur atom of a
sulfonyl group, X represents a
sulfonyl group, a
carbonyl group, or a phosphoryl group, R1 represents an
alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkynyl group having 2 to 6 carbon atoms, an
aryl group, an
alkoxy group having 1 to 4 carbon atoms, an alkenyloxy group having 2 to 6 carbon atoms, an alkynyloxy group having 2 to 6 carbon atoms, or an aryloxy group, and n represents 1 or 2.]