Slide fastener

A slide fastener capable of performing an open/insert operation, comprising a pair of first and second fastener stringers having rows of elements at opposite tape-side edge portions of left and right fastener tapes, a box pin extended from an end of the row of elements of the first fastener stringer, an insert pin extended from an end of the row of elements of the second fastener stringer, and a pair of first and second sliders slidably arranged along the rows of elements, wherein

• the first slider is arranged closer to the box pin than the second slider in a direction to which rear openings of the first and second sliders face each other,
• the box pin has a box pin body fixed to the fastener tapes, a stopper portion arranged at a front end side of the box pin body and for stopping the first slider, and a ridge portion formed on at least one of upper and lower surfaces of the box pin body and in close contact with an inner surface of a slider body of the first slider,
• a chamfered portion gradually reducing a plate thickness of an upper wing plate or a lower wing plate is formed on an inner surface of at least one of the upper and lower wing plates held by the first slider, and
• the ridge portion is arranged at a position in close contact with the chamfered portion of the first slider when the first slider is stopped at the stopper portion.