The invention relates to a roller shutter (10, 32, 42, 51) for opening and closing a doorway having a door leaf (11) and side rails (17) for guiding the door leaf (11), and having a coiling device (14) for selectively rolling up the door leaf (11) for opening the doorway and unrolling the door leaf (11) for closing the doorway. For reducing or avoiding the risk of creating a polygon effect and for providing a roller shutter (10, 32, 42, 51) comprising a door leaf having rigid shutter elements with an increased height and/or with the possibility of applying an increased speed for opening and/or closing the door leaf the roller shutter (10, 32, 42, 51) is characterized in that a separate guiding device (21, 33, 43) is provided for guiding the door leaf (11) in the area between the side rail (17) and the coiling device (14), wherein the guiding device (21, 33, 43) is arranged to adjust to an increasing diameter and to a decreasing diameter of the coiling device (14).