A fastener for a lace includes a metal base, two clamp assemblies, a pull unit, and an anchoring member. Each of the clamp assemblies includes a substantially U-shaped member which has two opposite arms pivotally connected to the metal base, a U-bend connected to the arms opposite to the metal base, and a clamp member connected between and transverse to the arms. The pull unit includes a middle portion disposed over the metal base, and two opposite pull members extending from the middle portion and connected respectively to the U-shaped members. The anchoring member is made of metal, and has a press part pressing the middle portion of the pull unit against the metal base, and a plurality of anchoring legs extending from the press part, penetrating the middle portion of the pull unit, and welded to the metal base.