The film of the present invention is provided, on the same long base material, with functional layer and a cleaning layer formed at the end surface in the running direction. With the cleaning layer positioned at the forefront, the film is delivered through a film forming apparatus equipped with a coater, etc., whereby the cleaning layer can remove foreign matters adhered on transporting rollers. The functional layer passes through after the cleaning layer has removed foreign matters. The film can be delivered without damaging the functional layer which is to be a product, and various treatments can further be carried out to the functional layer. According to the film of the present invention, the treatments can be carried out to the cleaning layer and functional layer on the same base material, thereby reducing the time and labor losses associated with the cleaning.