A slide fastener configured so that the strength of engagement between the fastener elements is assured even if the slide fastener is attached to highly stretchable clothes. The present invention comprises: a pair of fastener tapes (20); a pair of rows (30) of fastener elements, each of the pair of rows (30) of fastener elements being provided with fastener elements (31) which are arranged along a tape side edge section (20b) of each of the pair of fastener tapes (20) and also with a connection thread (22) which connects adjacent fastener elements (31), each of the pair of rows (30) of fastener elements being sewn to the tape side edge section (20b); and a slider (40) for engaging or disengaging the pair of rows (30) of fastener elements from each other. The fastener elements (31) each have a body section (33), a neck section (34) which is extended in the width direction of the tape from the body section (33), an engagement head section (35) which is extended in the width direction of the tape from the front end of the neck section (34), a pair of shoulder sections (36) which is provided on both sides of the neck section (34) with respect to the longitudinal direction of the tape and which comes into contact with mating engagement head sections (35). The pair of fastener tapes (20) can stretch in the longitudinal direction of the tapes.