<p>In a sealing device, an annular elastic section is secured to an annular core section, and the sealing device has a through-hole radially penetrating the core section and the elastic section. A porous member is secured to the through-hole, to the opening on its radially outer side, and the porous member has characteristics allowing air to pass through it and not allowing water and oil to pass through it. An eaves member having a cover plate positioned on the radially outer side of the porous member is secured to the outer peripheral surface of the core section.</p>
