Patent ID: 7871710

Claim:
A conductive material for a connecting part, comprising: a base material made up of a Cu strip; a Cu—Sn alloy covering layer having an average thickness of 0.2 to 3.0 μm; and an Sn covering layer, the Cu—Sn alloy covering layer being provided between the base material and the Sn covering layer, wherein in a cross section perpendicular to the surface of the conductive material, D 1 is the diameter of a minimum inscribed circle of the Sn covering layer and is drawn between the surface of the Cu—Sn alloy covering layer and the outermost surface of the material; D 2 is the diameter of a maximum inscribed circle of the Sn covering layer, the diameter [D 1 ] of the minimum inscribed circle of the Sn covering layer is 0.01 to 0.2 μm, the diameter [D 2 ] of the maximum inscribed circle of the Sn covering layer is 1.2 to 20 μm, the difference in elevation [y] between the outermost point of the material and the outermost point of the Cu—Sn alloy covering layer is 0.01 to 0.2 μm, and a bright or semi-bright tin electroplating layer having an average thickness of 0.01 μm or more in an approximately uniform thickness is formed on the outermost [layer] surface as part of the Sn covering layer.