The present invention is concerned with a nonaqueous electrolytic solution having an 
electrolyte salt dissolved in a nonaqueous 
solvent, the nonaqueous electrolytic solution containing a compound represented by the following general formula (X), in which a polar group (X) is bound to a 
phosphorus atom (P), and capable of improving electrochemical characteristics in a broad temperature range; an 
energy storage device using the same; and a novel compound.In the formula, R10 and R20 are each independently an 
organic group selected from the group consisting of an 
alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkynyl group having 3 to 6 carbon atoms, and an 
aryl group having 6 to 12 carbon atoms, or a 
lithium atom; and X is a polar group (i) containing a —C(═O) group, a —P(═O) group, or an —S(═O)2 group, a polar group (ii) containing a —
CN group or an 
alkyl group having 1 to 6 carbon atoms, in which a part of 
hydrogen atoms is substituted with a 
fluorine atom, or a 4- to 7-membered ring polar group (iii) containing a —C(═O)—O— group or a —C(═O)—N— group, provided that when X is a 4- to 7-membered ring polar group (iii) containing a —C(═O)—N— group, at least one of R10 and R20 is a 
lithium atom.