PURPOSE: To improve the straightness of an extra fine wire by annealing a wiredrawn extra fine metallic wire while applying tensile load and then carrying out forming.

CONSTITUTION: A metallic wire rod is wiredrawn into an extra fine wire of the prescribed diameter. Annealing treatment is applied to this extra fine wire while applying tensile load, by which straightness in the stage of wire can be improved. Subsequently, the above extra fine wire is formed into the pre scribed shape, or further, the above extra fine wire is subjected to plating with Ni, etc., and then to stress relief annealing treatment to remove residual strain and uniformize yield strength. As a result, forming precision at the time of forming into the prescribed shape can be improved.