A fastener includes a frame; a rotary shaft mounted to the frame and having a passage running through a center thereof; two ratchet wheels, a first lock member; a handle pivoted to the rotary shaft; a second lock member movably mounted to the handle and having an operation portion for a user's hand to operate to force the second lock member to disengage from the ratchet wheels; a rewinding member mounted to the handle and having a reel, a spring coil, and a shell; and a strap having two ends, one of which is mounted to the rewinding member and the other passes through the passage, and are wound around the rewinding member. Accordingly, the fastener allows the user to conveniently rewind the strap to enhance the user's operational hand feel.