Slide fastener

A slide fastener includes a pair of left and right fastener stringers each having an element row at each of opposing edge portions of left and right fastener tapes, and a slider configured to engage the element rows by moving forward between the pair of left and right fastener stringers and to disengage the element rows by moving backward. The slider includes an upper wing plate, a lower wing plate , a guide pillar for connecting the upper wing plate to the lower wing plate, a Y-shaped element path defined between the upper wing plate and the lower wing plate, left and right shoulder openings that are open forward the element path, and a rear opening that is open backward the element path.