Nonaqueous electrolytic solution and electrical storage device including the same

A nonaqueous electrolytic solution comprising a nonaqueous solvent and a compound represented by Formula (1) below:

• [Chem. 1]
• (wherein, in Formula (1), P and O are not abbreviations but symbols of element;
• X1 and X2 each independently represent C, S, or P;
• n1 and n2 each independently represent 1 when X1 and X2 represent C or P and 2 when X1 and X2 represent S;
• n1 represents 1 when X1 represents C or P and 2 when X1 represents S;
• n2 represents 1 when X2 represents C or P and 2 when X2 represents S;
• Y1 and Y2 each independently represent a hydrocarbon group that may have a substituent or an —OW group (where W represents a hydrocarbon group that may have a substituent);
• m1 represents 1 when X1 represents C or S and 2 when X1 represents P, and m2 represents 1 when X2 represents C or S and 2 when X2 represents P;
• and
• Z represents a hydrocarbon group that may have a substituent, an —SiV3 group (where V represents a hydrocarbon group that may have a substituent), an organic onium, or a metal).