Current collector, electrode for electricity storage device, lithium ion secondary battery, and method for producing current collector

Provided is a current collector including a resin layer having a first surface and a second surface on the opposite side from the first surface, and a metal layer containing copper, the metal layer including a first metal layer on the first surface side of the resin layer, the yield stress [sigma] Y1 of the current collector being less than the tensile breaking stress [sigma] B2 of the resin layer, and the yield stress [sigma] Y1 of the current collector being less than the tensile breaking stress [sigma] B2 of the resin layer. The yield stress [sigma] Y1 [MPa] of the current collector is a value obtained from the yield stress [sigma] Y2 [MPa] of the resin layer, the thickness D2 [[mu] m] of the resin layer, the yield stress [sigma] Y3 [MPa] of the metal layer, and the thickness D3 [[mu] m] of the metal layer by formulae (1) and (2). Yet stress [sigma] Y3 [MPa] of metal layer is a value determined by formula (3) from the half-value width [beta] [degree] of the X-ray diffraction peak having the highest intensi