PROBLEM TO BE SOLVED: To provide a copper alloy material excellent in conductivity and stress relaxation resistance property, and suitable for onboard parts such as EV and PHEV and surrounding infrastructures, a lead frame, a connector, a terminal material and the like of a sunlight power generating system and the like, and to provide its manufacturing method.SOLUTION: There are provided a copper alloy material containing Mg of 0.01 to 0.5 mass%, further at least one kind selected from a group consisting of Zn, Sn, Ag, P, Cr, Si, Zr and Ti of total 0.01 to 1.0 mass%, if needed, and the balance copper with inevitable impurities, and having a sum of an area percentage of W orientation of a sheet surface {001}<100> and a RDW orientation {210}<100> of 3% or more in a crystal orientation analysis in an electron backscattering diffraction measurement, the sum of grain boundary length of corresponding grain boundaries &Sgr;3 and &Sgr;9 in crystal grain boundaries of 5 to 20% of whole grain boundary, and the sum of g
