A slide fastener comprising: a pair of fastener stringers wherein each fastener stringer includes a fastener tape and a plurality of fastener elements attached to the fastener tape , each fastener element including a base portion secured to the fastener tape and a terminal portion positioned opposite to the base portion ; and at least one slider for opening and closing the pair of fastener stringers , the slider including an upper wing , a lower wing , a coupling pillar and a flange , the coupling pillar coupling the upper wing and the lower wing , the coupling pillar being opposed to or touched by a terminal surface of the terminal portion of the fastener element , the flange being provided at least one of the upper wing and the lower wing , and the flange being opposed to or touched by a base end surface of the base portion of the fastener element , wherein the fastener element has an intermediate portion including bent or curved portion between the terminal portion and the base portion , the intermediate portion has an engaging protrusion and an engaged recess which are respectively protruded and recessed on an axis (CL) that matches a movement direction of the slider , the engaging protrusion having a vertex positioned on the axis (CL) and the engaged recess having a bottom point positioned on the axis (CL), in an orthogonal direction orthogonal to the axis (CL), a first distance (L1) between the axis (CL) and the terminal surface of the terminal portion is less than a second distance (L2) between the axis (CL) and the base end surface of the base portion , the slide fastener is characterized in that , the fastener element has a first recess recessed between the engaging protrusion and the base portion . a pair of fastener stringers wherein each fastener stringer includes a fastener tape and a plurality of fastener elements attached to the fastener tape , each fastener element including a base portion secured to the fastener tape and a terminal portion positioned opposite to the base portion ; and at least one slider for opening and closing the pair of fastener stringers , the slider including an upper wing , a lower wing , a coupling pillar and a flange , the coupling pillar coupling the upper wing and the lower wing , the coupling pillar being opposed to or touched by a terminal surface of the terminal portion of the fastener element , the flange being provided at least one of the upper wing and the lower wing , and the flange being opposed to or touched by a base end surface of the base portion of the fastener element , wherein the fastener element has an intermediate portion including bent or curved portion between the terminal portion and the base portion , the intermediate portion has an engaging protrusion and an engaged recess which are respectively protruded and recessed on an axis (CL) that matches a movement direction of the slider , the engaging protrusion having a vertex positioned on the axis (CL) and the engaged recess having a bottom point positioned on the axis (CL), in an orthogonal direction orthogonal to the axis (CL), a first distance (L1) between the axis (CL) and the terminal surface of the terminal portion is less than a second distance (L2) between the axis (CL) and the base end surface of the base portion , the slide fastener is characterized in that , the fastener element has a first recess recessed between the engaging protrusion and the base portion . <EOS>