Slide fastener and method for manufacturing separable bottom end stop box for slide fastener

A slide fastener comprising:

• a pair of first and second fastener stringers;
• at least one slider configured to open and close a space between the first and second fastener stringers;
• and
• a separating insert provided at a lower end portion of the first and second fastener stringers in a longitudinal direction, wherein
• the separating insert includes
• a first separating insert portion provided on the first fastener stringer and
• a second separating insert portion provided on the second fastener stringer and capable of being coupled to and decoupled from the first separating insert portion,
• the first separating insert portion includes a separable pin provided on a width direction inner edge side of the first fastener stringer,
• the second separating insert portion includes a retainer provided on a width direction inner edge side of the second fastener stringer,
• the retainer includes a separable pin hole which opens to an upper side and into or from which the separable pin can be inserted or removed in the longitudinal direction,
• at least one of a front surface and a back surface of the separable pin is provided with a recess,
• among inner surfaces forming the separable pin hole of the retainer, at least one of a front side surface and a back side surface facing the front surface and the back surface of the separable pin is provided with a convex portion engageable with the recess,
• the convex portion has a non-symmetrical shape with respect to a plane passing through a central portion of the convex portion in an insertion or removal direction of the separable pin and perpendicular to the insertion or removal direction,
• the convex portion includes an upper inclined surface that increases a thickness of the convex portion downward from an upper end portion of the convex portion in the insertion or removal direction of the separable pin and a lower inclined surface that increases the thickness of the convex portion upward from a lower end portion of the convex portion in the insertion or removal direction of the separable pin, and
• an inclination of the upper inclined surface is larger than an inclination of the lower inclined surface.