Slide Fastener

A slide fastener having a pair of first and second fastener stringers in which an element row is formed in right and left fastener tapes, a pair of first and second separable interfitting parts fixed to one end of each of the element rows in the first and second fastener stringers, and a slider slidably attached along the element row of the first fastener stringer, wherein the slider includes a diamond, upper and lower blades connected to the diamond, a flange arranged at right and left side edges of at least one of the upper and lower blades, and a tape insertion gap formed at right and left side edges of the slider, the first separable interfitting part includes a slider-holding part that holds the slider on a sliding end, and the second separable interfitting part is configured to be insertable/removable into/from the slider held on the slider-holding part in a tape width direction through the tape insertion gap, wherein

• the second separable interfitting part includes a body part in a thin-plate shape fixed to the fastener tape and a protruding part arranged at an end on a side of the element row of the body part and formed thicker than the body part,
• the protruding part includes an opposed end arranged on the side opposite to the first separable interfitting part and a side surface arranged on the opposite side to the side opposite to the first separable interfitting part, and
• if a dimension of the protruding part in the tape width direction is defined as a first dimension A, a dimension between a back end on the opposite side of the side of the element row on the side surface of the protruding part and the opposed end on the side opposite to the first separable interfitting part is defined as a second dimension B, and a dimension equal to an interval between the diamond and the flange in an element guide passage on a shoulder side of the slider is defined as a third dimension C, the protruding part has a relationship of the first dimension A<the third dimension C<the second dimension B.