An axial lip having a diameter expanding outward of a rolling bearing is formed on that side surface of a seal for the bearing which faces a slinger. A projection formed by axially bending the slinger so that the bent portion projects inward of the bearing is formed on that flat surface of the slinger which faces the seal. The front end of the axial lip is in contact with the flat surface of the slinger at a position radially outward of the projection of the slinger. A labyrinth is formed between a radially inward inner surface of the axial lip and an outer diameter-side slope surface formed radially outward of the projection of the slinger, and a labyrinth is formed between the top of the projection of the slinger and that side surface of the seal which is radially inward of the position at which the axial lip is formed.
