Abstract: A grinding device, including: a closed grinding chamber for accommodating a material to be ground and for accommodating a plurality of grinding bodies that can be moved together with the material; a stirring unit accommodated in the grinding chamber, which stirring unit is rotatably operatively connected to a drive unit arranged outside of the grinding chamber; a bearing unit, which guides the shaft and is arranged in the region of an opening of the grinding chamber; and at least one wear disk, which keeps the bearing unit covered at least in some regions with respect to the material to be ground and which lies against a counter surface associated with the bearing unit.