LAYERED BODY, NEGATIVE ELECTRODE CURRENT COLLECTOR FOR LITHIUM ION SECONDARY BATTERY, AND NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY

A laminated body contains a first metal layer containing copper; and a second metal layer containing nickel and laminated directly on the first metal layer. A first surface of the second metal layer is a surface in contact with the first metal layer. A second surface of the second metal layer is a reverse face of the first surface. A thickness direction of the second metal layer is a direction approximately perpendicular to the first surface and oriented from the first surface toward the second surface. A unit of a content of nickel in the second metal layer is % by mass. The content of nickel in the second metal layer 2 decreases along the thickness direction D.