Disclosed is an additive for non-aqueous electrolyte solutions, which include a compound represented by Formula (1). In Formula (1), X represents a sulfonyl group or a carbonyl group, R1 represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a halogen atom, or the like, and R2 represents a divalent hydrocarbon group having 1 to 3 carbon atoms which may be substituted with a halogen atom, or represents a divalent group formed of a divalent hydrocarbon group having 1 to 3 carbon atoms which may be substituted with a halogen atom, and an oxygen atom that constitutes a cyclic structure together with the hydrocarbon group.