To provide a fastener for a completely new belt-like member that is provided with a mechanism for increasing friction by increasing the tightening force and the contact area by a swinging member installed at around the center while utilizing the friction.

The main structure of the fastener for belt-like member is provided with a swinging member that is installed at around the center and swings towards the belt-like member and supporting sections that are installed on the upstream side and the downstream side of the belt-like member against the swinging member and have their ends in a direction perpendicular to the direction of the belt-like member. The swinging ends of the swinging member are separated from the supporting members on both sides at a distance that at least allows the belt-like member to penetrate when it comes closest.