A carabiner includes a retaining frame, wherein each of two opposite sides of the retaining frame has a pivotally connecting portion and an inserting tube, respectively. The inserting tube has an inserted hole inside and is fitted around by a socket portion of a hook-shaped tube of the hook member. A wire rope passes through the hook-shaped tube. A bottom end of the wire rope is inserted into the inserted hole. A nose is engaged with a free end of the hook-shaped tube and a free end of the wire rope. A portion, where the socket portion, the inserting tube, and the wire rope are overlapped, is compressed to fix. The pivotally connecting portion is pivotally connected to a gate member. A top end of the gate member is detachably hooked to the nose. With such design, the weight of the carabiner could be reduced without worsening the safety.