The mechanical properties and electrical conductivity of Cu_100−xZr_x (x=0–8 at%) alloys were examined, whereby the alloys were prepared by casting levitation-melted alloys into a pure copper die and then subsequently cold rolled to a thickness of 200 μm except for the alloys where x=7 and 8. The ultimate tensile strength (σ_UTS), 0.2% proof strength (σ_0.2) and Vickers hardness (H_V) of the prepared Cu_100−xZr_x alloys increase linearly with x, elongation ε_P is almost independent of x and the electric conductivity (%IACS) decreases when the Zr concentration x increases. The highest values of σ_UTS, σ_0.2, ε_P and H_V for the Cu_100−xZr_x alloys are 1200 MPa, 800 MPa, 3% and 290, respectively, at x=6 and its electrical conductivity is 35%IACS.