PROBLEM TO BE SOLVED: To reliably prevent the entry of water into a one-way clutch.SOLUTION: In front of a one-way clutch 5, a first seal member 8 prevents the entry of water into the one-way clutch 5. In front of the first seal member 8, a second seal member 9 prevents the entry of water into the one-way clutch 5. The second seal member 9 includes a first inner peripheral surface 91 opposed to an outer peripheral surface of a cylindrical member 7 at a distance. At least one of the first inner peripheral surface 91 and the outer peripheral surface of the cylindrical member 7 is water-repellent.
