A guide device for guiding a furniture part movable relative to a furniture body comprises: a guide unit including a body rail fixable to the furniture body; a sliding rail connectable to the movable furniture part and displaceably mounted relative to the body rail via a rail guide movable in a sliding direction, wherein the rail guide is mounted displaceably relative to the body rail and the one sliding rail and, when withdrawn to an open position, abuts against stops on the body rail and sliding rail; and a damper to damp the impact of the rail guide on at least one of the stops. The rail guide comprises at least two guide sections arranged behind one another in the sliding direction. The guide sections are connected to one another by a damping section that is flexible in the sliding direction and equipped with the damper.