Abstract: A guide rail device for laterally guiding a rolling door or rolling grille armor of a rolling door or rolling grille includes a guide rail for vertically guiding the rolling door or rolling grille armor, an infeed funnel for guiding the rolling door or rolling grille armor into an entry area of the guide rail, with the infeed funnel being movable relative to the guide rail, and a damping body connected to the infeed funnel which dampens vibrations and shocks of the infeed funnel. Further, a rolling door or rolling grille includes a first guide rail device and a second guide rail device. In particular, the guide rail of the first guide rail device is fixed laterally on the building opening, and the guide rail of the second guide rail device is fixed laterally on the opposite side of the building opening.