A cord fastener includes an insert (1) having a head portion (2) with a first through hole (2h), a plurality of elastic legs (3) extending downward from the head portion (2) and outward projecting catches (4) formed below the opposite ends of the first through hole (2h); and a shell (11) having an insertion hole (12) the lower portion of which is tapered downward by inclined surfaces (12f) and second lateral through holes (13) communicating with the insertion hole (12) and, when the insert (1) has been filled into the insertion hole (12), communicating with the first through hole (2h). <IMAGE>
