PROBLEM TO BE SOLVED: To provide a Cu-Zr-Ti-based alloy strip combining excellent conductivity, strength, stress relaxation characteristics and forming workability and an electronic part which is produced by using the copper alloy strip and is suitable for large-current applications and heat release applications.SOLUTION: A Cu-Zr-Ti-based copper alloy strip comprises one or both of Zr and Ti in a combined content of 0.01-0.50 mass% and remaining copper and unavoidable impurities and has an absolute value of in-plane anisotropy (&Dgr;r) of a Lankford value, defined below, of 0.2 or smaller. &Dgr;r=(r+r-2×r)/2, where r, rand rare r values in directions having angles to the rolling direction of 0, 45 and 90 degrees, respectively.
