PURPOSE: To prolong the service life of a stamper and to improve the quality of an optical disk at the time of forming by increasing the hardness of the front signal side or the front signal side and the rear side of the stamper which becomes a master for an optical disk, reducing friction and increasing heat insulation.

CONSTITUTION: In a process for producing a master for an optical disk, a nickel plating film 14 contg. 20-30% polytetrafluoroethylene (PTFE) 16 having ≤0.1μm particle diameter is formed on the front side of a stamper by electroless plating in 50-70nm thickness. Since the surface hardness of the resulting master for an optical disk is increased and friction is reduced, the service life of the master is prolonged and the releasability of the inner circumference and that of the outer circumference can be made uniform by increased heat insulation to enhance forming efficiency. When the master is used, an optical disk excellent in optical characteristics and having fine appearance can be formed.