Abstract: A current collector effective for reductions in weight and thickness. The current collector produced by forming a conductive layer having a surface electric resistance not higher than 1.3 ?/cm on the surface of a resin film and then forming an electrolytic plating layer having a thickness of at least 0.3 ?m per one side, characterized in that the surface electric resistance is not higher than 40 m ?/cm after electrolytic plating and following expression is satisfied; Y1+Y2+Y3?0.8×((X1+X2+X3)×Y3/X3) where, X1: thickness of resin film (?m), X2: thickness of conductive layer (?m), X3: thickness of plating layer (?m), Y1: weight of resin film (mg/cm2), Y2: weight of conductive layer (mg/cm2), and Y3: weight of plating layer (mg/cm2).