Slider for slide fastener

A slider for a slide fastener comprising a slider body and a tab coupled with the slider body, wherein the slider body at least comprises an upper wing plate from which a tab-attaching post extends, a lower wing plate opposed to the upper wing plate, a neck connecting a shoulder-opening-side tip portion of the upper wing plate and a shoulder-opening-side tip portion of the lower wing plate to each other, and left and right lower flanges extending from left and right side edges of the lower wing plate toward the upper wing plate, wherein:

• each of the left and right lower flanges includes a flange upper surface that opposes the upper wing plate, a flange outer surface, a flange front end surface that faces the shoulder-opening-side-tip portion of the lower wing plate, and a downwardly inclined surface portion which downwardly inclines toward a shoulder of the slider and downwardly inclines toward an outer side of the slider in a width direction of the slider such that each downwardly inclined surface portion slopes downward in two different directions and a height in a vertical direction of each of the lower flanges is reduced along each downwardly inclined surface portion in (1) a length direction from the flange upper surface toward the shoulder of the slider and (2) the width direction from an inner portion of the slider toward the outer side of the slider,
• each of the downwardly inclined surface portions is bounded by three ridge lines and is triangular in shape, and
• a first of the three ridge lines of each triangularly shaped downwardly inclined surface portion is on one of the flange upper surfaces, a second of the three ridge lines of each triangularly shaped downwardly inclined surface portion is on one of the flange outer surfaces, and a third of the three ridge lines of each triangularly shaped downwardly inclined surface portion is on one of the flange front end surfaces and extends obliquely with respect to the one of the flange upper surfaces and the one of the flange outer surfaces to connect end portions of the first and the second of the three ridge lines.