Layered body, negative electrode current collector for lithium ion secondary battery, and negative electrode for lithium ion secondary battery

A laminated body comprising:

• a first metal layer containing copper;
• and
• a second metal layer containing nickel and laminated directly on the first metal layer,
• wherein 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 surface 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 increases along the thickness direction, and
• wherein a thickness of the first metal layer is represented by T1,
• a thickness of the second metal layer is represented by T2, and
• T2/T1 is 0.6 or more and 1.0 or less.