Abstract: The present invention is to provide a fastening device formed at a cable of an earphone, the fastening device comprising a first half member and a second half member, both of the two members having a clipping end at one end, a holding end at the other end and a central hinge disposed therebetween with a shaft passing therethrough and a spring put on the shaft, the spring having both ends urged against the first half member and the second half member; wherein the first half member further comprises a recess for fitting a receiver of the earphone therein and a fastening element for securing the receiver in the recess.