Slider for concealed type slide fastener

A slider for a concealed type slide fastener for engaging or disengaging respective engaging elements of a pair of fastener stringers, each of the fastener stringers having a plurality of engaging elements attached along an outside surface of a folded end edge of each of side edge portions which are bent and fixed into a U shape such that they oppose each other, wherein the slider comprises:

• a lower blade having a pair of first flanges each having an inverted L-shaped section, which are erected along right and left side edge portions orthogonal to a sliding direction of the slider;
• a diamond erected in a central portion at one end in a sliding direction of the lower blade;
• and
• a second flange arranged between top plate portions of the pair of first flanges and having a rectangular plate portion formed integrally with a top surface of the diamond and a wedge plate portion extending from the rectangular plate portion in a sliding direction, the second flange being stretched outside along an outer periphery of the diamond,
• wherein at least in an outside area of a diamond side of a portion of a peripheral surface of the second flange, the portion intersecting with a straight line passing a diamond side end face of each of the right and left top plate portions of the right and left first flanges, a tapered surface expanded upward from a bottom end thereof is formed, and
• wherein a top end ridge line of the tapered surface is set lower than a top surface of each of the top plate portions of the first flanges and higher than a height between a top surface of the lower blade and a bottom surface of each of the top plate portions.