Abstract: In a slide fastener, among inner surfaces forming a separable pin hole of a retainer, at least one of a front side surface and a back side surface facing a front surface and a back surface of a separable pin is provided with a convex portion engageable with a recess. 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. An inclination of the upper inclined surface is larger than an inclination of the lower inclined surface.