Composite copper member

The purpose of the present invention is to provide a novel composite copper member. Provided by the present invention is a composite copper member which has a metal layer comprising metal other than copper formed on micro irregularities including copper and copper oxide on at least some of the surfaces of the copper member, wherein the surface of the composite copper member where the metal layer is formed has micro irregularities, the mean length of roughness profile elements (Rsm) of the surface of the composite copper member is 550 nm or less, the surface-area ratio is 1.3 to 2.2, and the average thickness of the metal layer in the vertical direction is 15 nm to 150 nm. 本发明的目的在于提供一种新型的复合铜材料。利用本发明，提供一种复合铜材料，其是在铜材料的至少一部分表面的含有铜和铜氧化物的微细凹凸上形成有由铜以外的金属构成的金属层的复合铜材料，形成有上述金属层的上述复合铜材料的表面具有微细的凹凸，上述复合铜材料的上述表面的粗糙度曲线要素的平均长度(Rsm)为550nm以下，表面积率为1.3以上2.2以下，上述金属层的垂直方向的平均厚度为15nm以上150nm以下。