An adjusting device for a safety belt in a vehicle comprises at least one extendable belt guiding element which is provided for guiding a portion of the safety belt and at least one supporting element which is connected to the belt guiding element and which is able to be at least partially extended together with the belt guiding element. The belt guiding element is able to be extended from a resting position in a direction of extension in order to facilitate the grasping of the safety belt by a vehicle occupant when fastening the safety belt. The supporting element is flexible but in the extended state of the belt guiding element is sufficiently rigid at least in one portion transversely to the direction of extension such that the belt guiding element is held in an extended position via the now rigid portion of the supporting element.