Excellent in tin-plated copper alloy terminal plug material and manufacturing method thereof

The present application discloses a connection at the same time exhibiting excellent electrical characteristics would reduce dynamic friction coefficient of 0.3 or less, plug excellent in tin-plated copper alloy material for terminal and its manufacturing method. A terminal member of the invention is the formation of the Sn-based surface layer formed on a surface of a substrate made of Cu or Cu alloy is formed Ni-containing CuNiSn alloy layer between the Sn-based surface layer and the tin-plated copper base alloy terminal material the CuNiSn alloy layer consisting of Ni content is at least 10at% 40at% or less of the cross-sectional diameter above 0.8μm 0.1μm or less, the CuNiSn alloy particle aspect ratio of 1.5 or more and the fine columnar crystal cross-sectional diameter than the CuNiSn alloy coarse particles constituted 0.8μm , and the average thickness of the Sn-based surface layer is 0.2μm or less than 0.6μm, the surface of the Sn-based surface layer of the exposed area of ​​the CuNiSn alloy layer is 10% or 40% or less, and the dynamic friction coefficient of 0.3 or less.