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 that matches a movement direction of the slider, the engaging protrusion having a vertex positioned on the axis and the engaged recess having a bottom point positioned on the axis, in an orthogonal direction orthogonal to the axis, a first distance between the axis and the terminal surface of the terminal portion is less than a second distance between the axis 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 that matches a movement direction of the slider, the engaging protrusion having a vertex positioned on the axis and the engaged recess having a bottom point positioned on the axis, in an orthogonal direction orthogonal to the axis, a first distance between the axis and the terminal surface of the terminal portion is less than a second distance between the axis 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.