PURPOSE: To improve the releasing property of a mold and the durability thereof by a method wherein plated film in which fluororesin grains are eutectic is formed on the surface facing a molding cavity and fluororesin grains exposed on the surface and fluororesin supplied are softened and melted to form a fluororesin film layer.

CONSTITUTION: Grains 5' exposed on the eutectic plated film 3 of fluororesin grains formed on the cavity surface 2 of a mold body 1 and fluororesin newly supplied to the plated film 3 are heated and melted to form a fluororesin film layer 6. Tetrafluoride ethylene chloride resin, tetrafluoride ethylene-hexafluoride propylene copolymeric resin, trifluoride ethylene chloride resin, fluoride vinylidene resin, fluoride vinyl resin, etc. are applied independently or in combination. A suitable metal is selected according to uses etc. as the matrix 4 of the plated film 3. This resin film layer mold can be applied to ingection, extrusion, blow molding or casting of plastics, rubber, glass, etc.