A zipper is provided which is designed so that when a slider is pulled down until it comes into contact with a box, the engagement between the protrusion of an insertion pin and a coupling member is released to enable the insertion pin to be reliable can be removed from the box. The opener (50) of this zipper (10) is provided with the following: a box pin (51) which is provided on a zipper carrying strap (20); and an insertion pin (53) provided on the other zip fastener tape (20). The insertion pin (53) is provided with a projection (54) which is brought into engagement with a coupling element (E) which is arranged at one end of the coupling element row (30) of the one zipper carrying band (20). The curvature (45) of a slide (40) and the insertion pin (53) are each provided with contact sections (45a, 55) which come into contact with one another in the direction of movement of the slide (40), and the contact section (45a) of the curvature (45 ) of the slide (40) and / or the contact section (55) of the insertion pin (53) are provided with a cutting section (56) which obliquely cuts the direction of movement of the slide (40).
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