Slider for slide fastener and quick open-type slide fastener

A slider for a slide fastener through which first and second zipper teeth rows attached to edges of a pair of first and second fastener stringers facing each other are inserted and which switches the first and second zipper teeth rows to an engaged or disengaged state, the slider comprising:

• upper and lower wing pieces;
• a connection post that is disposed between first and second shoulder mouths and connects the upper wing piece with the lower wing piece;
• and
• a flange that extends from a first side edge of at least one of the upper and lower wing pieces,
• wherein a first tape insertion passage where a fastener tape of the first fastener stringer is inserted and guided is formed at an end edge of the flange,
• wherein a zipper teeth guide passage through which the first and second zipper teeth rows are inserted is formed in the slider,
• wherein the slider is configured so that when the first fastener stringer and the second fastener stringer are in an engaged state and lateral pulling forces in a left-right direction are applied to the first fastener stringer and the second fastener stringer near the first and second shoulder mouths, zipper teeth of the first zipper teeth row are bitten into the first tape insertion passage, and a width of the first tape insertion passage increases and at least a portion of one of the upper and lower wing pieces is bent outwards, so that the zipper teeth of the first zipper teeth row exit the zipper teeth guide passage across the end edge of the flange.