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1. A copper alloy sheet material, having a composition comprising, in mass %, Ti: 1.0 to 5.0%, Al: 0.5 to 3.0%, Ag: 0 to 0.3%, B: 0 to 0.3%, Be: 0 to 0.15%, Co: 0 to 1.0%, Cr: 0 to 1.0%, Fe: 0 to 1.0%, Mg: 0 to 0.5%, Mn: 0 to 1.5%, Nb: 0 to 0.5%, Ni: 0 to 1.0%, P: 0 to 0.2%, Si: 0 to 0.5%, Sn: 0 to 1.5%, V: 0 to 1.0%, Zn: 0 to 2.0%, Zr: 0 to 1.0%, and S: 0 to 0.2%, the total content of Ag, B, Be, Co, Cr, Fe, Mg, Mn, Nb, Ni, P, Si, Sn, V, Zn, Zr, and S among the elements being 3.0% or less, and balance of Cu, with unavoidable impurities, wherein in an observation plane parallel to a sheet surface, a maximum width of a grain boundary reaction type precipitate existing region is 1000 nm or less, a KAM value is 3.0° or less when a boundary with a crystal orientation difference of 15° or more in the measurement with a step size of 0.1 μm by EBSD (electron backscatter diffraction) of the observation plane parallel to the sheet surface is regarded as a crystal grain boundary, and a tensile strength in a rolling direction is 850 MPa or more.
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