A nonaqueous electrolyte solution which contains a nonaqueous solvent and a compound represented by formula (1). (In formula (1), each of R1-R5 independently represents a hydrogen atom or an optionally substituted alkyl group having 1-3 carbon atoms; R6 represents an organic group having 1-8 carbon atoms, which optionally has a heteroatom; X represents a carbon atom, a sulfur atom or a phosphorusatom; in cases where X is a carbon atom, l = 0, m = 1 and n = 1; in cases where X is a sulfur atom, l = 0, m = 2 and n = 1; in cases where X is a phosphorus atom, l = 0, m = 1 and n = 2, or alternatively, l = 1, m = 1 and n = 1; k represents an integer of from 2 to 4 (inclusive); and Y represents a direct bond or a linking group having 1-8 carbon atoms, which optionally has a heteroatom, providedthat in cases where Y is a direct bond, there is an X-X bond and k = 2.)