A device for infeeding a material web along an infeed path into a rotary printing machine includes drive stations arranged along the infeed path, and an infeed element partially enclosed by a guide formed with a lateral opening at which a material web is fastenable on an extension piece. The infeed device further includes a profiling provided on the infeed element for stiffening the infeed element in an advancement direction along the infeed path. A rotary printing press is provided with the infeed device; and a newspaper rotary printing press is similarly provided.