Slide fastener

To provide a slide fastener configured so that, in a state in which a slide member for sealing is sandwiched between the two sliders of the slide fastener, the sealing properties between the slide member and the sliders are improved. A slide fastener is provided with: a pair of fastener stringers (2); a pair of sliders (3) which opens and closes the pair of fastener stringers; and a slide member (4) which is provided so as to be slidable along the pair of fastener stringers and which is sandwiched between the pair of sliders. The slide member is provided with: an upper plate section (51) and a lower plate section (52), which are arranged above and below the facing side edges of the pair of fastener stringers; a connection section (53) which, between the facing side edges, connects the upper plate section and the lower plate section; cover sections (6) which protrude forward and rearward from the upper part of the upper plate section; and guide sections (54) which protrude forward and rearward from the lower p