An object of the present invention is to provide a copper member with a novel composite surface treatment layer. According to the present invention, a composite copper member in which a metal layer made of metal atoms other than copper is formed on at least a part of the surface of the copper member, wherein the surface of the composite copper member on which the metal layer is formed has a fine convex portion, and a transmissive electron By energy dispersive X-ray analysis (EDX) using a microscope (TEM), copper atoms and oxygen atoms other than the metal atoms are detected in any diameter range of 10 nm of the surface of the composite copper member, characterized in that A copper member is provided.
展开▼
