To provide a feeding mechanism preventing a transported film from deviated running relative to a feed roll without using a means to cause a drop in the bag making efficiency and/or the takeup efficiency such as lowering the film transporting speed or giving an extra-tension to the transported film.

The film feeding mechanism is equipped with a set part 1 for a film 2 wound in a roll, a roller part to support and guide the feed of the film 2 paid off from the set part 1 to the next mechanism such as a bag making mechanism 5 or a takeup mechanism, and a processing mechanism as the next process to make a bag from or take up the film 2 transported via the roller part. A roller 4 used in the supporting and guiding roller part is formed approximately in an hourglass shape.