Copper alloy and electrically conductive material for connecting parts, and mating-type connecting part and method for producing the same

A copper sheet, comprising:

• a Cu—Sn alloy coating layer and
• a Sn or Sn alloy coating layer on an outermost surface thereof,
• wherein the copper sheet has a surface roughness defined by:
• an arithmetic mean roughness Ra of 0.5 μm or more and 4.0 μm or less in a direction parallel to a sliding direction upon connection,
• a mean projection-depression interval RSm of 0.01 mm or more and 0.3 mm or less in the direction parallel to the sliding direction,
• a skewness Rsk of less than 0, and
• a protrusion peak portion height Rpk of 1 μm or less in the direction parallel to the sliding direction,
• and wherein the copper sheet is suitable for a connecting part having the Sn coating layer present as a plurality of parallel lines satisfying either or both of conditions (A)-(B):
• (A) the lines have substantially constant width and are spaced at substantially regular intervals, and/or
• (B) the lines have substantially constant width over a continuous length thereof.