NONAQUEOUS ELECTROLYTE SOLUTION BATTERY LEAD WIRE AND NONAQUEOUS ELECTROLYTE SOLUTION BATTERY

A nonaqueous electrolyte solution battery lead wire of the present disclosure includes a conductor and an insulating film having one or a plurality of layers and covering at least part of an outer peripheral surface of the conductor. The conductor has a conductor film covering at least part of a surface thereof, the conductor film contains a trivalent chromium compound including chromium hydroxide and a metal element, a ratio of a mass of chromium contained in the chromium hydroxide per unit area [mg/m] to a mass of chromium contained in the trivalent chromium compound per unit area [mg/m] is 0.30 to 0.90 at an outermost surface of the conductor film, the insulating film has an innermost layer stacked on a surface of the conductor film, the innermost layer contains, as a main component, a resin component including maleic anhydride-modified polypropylene.