An electrolytic solution for nonaqueous electrolytic solution secondary batteries, the electrolytic solution including a difluoro ionic complex represented by the general formula , a nonaqueous organic solvent, and a solute, wherein 95 mol% or more of the difluoro ionic complex is a difluoro ionic complex (1-Cis) in a cis configuration represented by the general formula (1-Cis), wherein in (1-Cis), is wherein in the general formulas and (1-Cis), A + is any one selected from the group consisting of a metal ion, a proton, and an onium ion; M is any one selected from the group consisting of Si, P, As, and Sb; F is a fluorine atom; O is an oxygen atom; t is 2 when M is Si, and t is 1 when M is P, As, or Sb; X is an oxygen atom or -N(R 1 )-; N is a nitrogen atom; and R 1 is a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom (the hydrocarbon group optionally having a branched-chain or ring structure when the number of carbon atoms is 3 or more); when X is -N(R 1 )- and p is 0, X and W are bonded directly and optionally form a structure as shown in the general formulas to below; in the case of the general formula below where the direct bond is a double bond, R 1 is not present, Y is a carbon atom or a sulfur atom; q is 1 when Y is a carbon atom; q is 1 or 2 when Y is a sulfur atom, W represents a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom (the hydrocarbon group optionally having a branched-chain or ring structure when the number of carbon atoms is 3 or more), or-N(R 2 )-, wherein R 2 represents a hydrogen atom, an alkaline metal, or a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom; when the number of carbon atoms is 3 or more, R 2 optionally has a branched-chain or ring structure, and p is 0 or 1, q is an integer of 0 to 2, r is an integer of 0 to 2, and p + r ≥ 1. wherein in the general formulas and (1-Cis), A + is any one selected from the group consisting of a metal ion, a proton, and an onium ion; M is any one selected from the group consisting of Si, P, As, and Sb; F is a fluorine atom; O is an oxygen atom; t is 2 when M is Si, and t is 1 when M is P, As, or Sb; X is an oxygen atom or -N(R 1 )-; N is a nitrogen atom; and R 1 is a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom (the hydrocarbon group optionally having a branched-chain or ring structure when the number of carbon atoms is 3 or more); when X is -N(R 1 )- and p is 0, X and W are bonded directly and optionally form a structure as shown in the general formulas to below; in the case of the general formula below where the direct bond is a double bond, R 1 is not present, Y is a carbon atom or a sulfur atom; q is 1 when Y is a carbon atom; q is 1 or 2 when Y is a sulfur atom, W represents a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom (the hydrocarbon group optionally having a branched-chain or ring structure when the number of carbon atoms is 3 or more), or-N(R 2 )-, wherein R 2 represents a hydrogen atom, an alkaline metal, or a hydrocarbon group having 1 to 10 carbon atoms and optionally having a hetero atom and/or a halogen atom; when the number of carbon atoms is 3 or more, R 2 optionally has a branched-chain or ring structure, and p is 0 or 1, q is an integer of 0 to 2, r is an integer of 0 to 2, and p + r ≥ 1. <EOS>