To provide a method for feeding which allows the precise and stable supply of a resin film having a thickness of, for example, 10-500 μm to a predetermined processing means or storage means without generating form defects such as wrinkles and curls regardless of whether it has airtightness or not.

The method comprises the continuous steps of: lapping an unvulcanized rubber sheet 14 cut in a predetermined length while conveying horizontally the long resin film 12 backed with a sheet 13 over the surface of the resin film 12 successively from its front end; removing the backing sheet 13 from the resin film 12 and sequentially cutting the resin film 12 in a predetermined length after completion of lapping it, and supplying the resin film 12 to a molding roll 7.