Disclosed is a fastener provided at an upper surface of a shoe. The shoe fastener is easily inserted through eyelets and is not easily separated once fastened. The fastener is formed of flexible silicone or synthetic rubber and includes a center connection portion and eyelet insertion portions formed at both sides of the connection portion. Each eyelet insertion portion is composed of upper and lower extension portions and a center outwardly bulged portion, and the bulged portion has a length equal to a diameter of the eyelet.