PURPOSE: To suppress entrapment of air bubbles when a resin film is laminated to a metal strip at a high speed by a press bonding roll.

CONSTITUTION: A resin film 2 is laminated to a metal strip 1 by a press bonding roll 3 while air is ejected from one side end part of the metal strip 1 to the other side end part thereof along the gap of the press bonding start part generated between the resin film 2 and the metal strip 1 at flow velocity of 10-300m/sec in the lateral direction of the metal strip 1. The temp. of air to be ejected is equal to or higher than that of the metal strip 1 immediately before lamination but does not pref. exceed the temp. of the metal strip 1 by 50°C or higher. It is also effective to arrange a guide plate 6 guiding jet air 5 along the gap of the press bonding start part generated between the resin film 2 and the metal strip 1.