To prevent damage to a toilet bowl by arranging a covering piece to cover a slider of a fastener in a closing end part of the fastener of a cover main body.

Teeth 2a of a fastener 2 are arranged on both side edges of a belt-like cover main body 1, and in a closing end part of the fastener 2, a covering piece 4 having one locking installing surface of a surface fastener 3 on the reverse is arranged on one side edge of the cover main body 1. A locking installing piece 5 having the other locking installing surface of the surface fastener 3 on the obverse is sewn on the other side edge of the over main body 1. The covering piece 4 is superposed on the locking installing piece 5, and when these are engaged with and installed on each other by the surface fastener 3, since a slider 2b of the fastener 2 is covered with the covering piece 4, even if a seat is brought down, a handle 2d does not hang down. Therefore, damage to a toilet bowl by the slider can be prevented.