Slide fastener and slide fastener-attached product

A slide fastener comprising:

• a pair of fastener stringers in each of which a plurality of fastener elements are provided at a fastener tape to form an element row;
• and a slider that is attached to the element rows to be slidable, wherein
• the slider includes a slider body, the slider body including an upper wing plate and a lower wing plate that are disposed to be separated from each other, a coupling column that couples the upper wing plate and the lower wing plate to each other, and a flange that extends from a side edge portion of at least one of the upper wing plate and the lower wing plate,
• the slider body is provided with an element guide passage that is formed into a Y-shape between the upper wing plate and the lower wing plate, a pair of shoulder ports that are each provided at a side of the coupling column such that the coupling column is interposed between the pair of shoulder ports, and an insertion gap that is provided at a side edge portion of the slider body and that is in communication with the element guide passage,
• each of the fastener elements includes an element base portion including a portion whose dimension in a tape thickness direction of the fastener tape is constant, and a fin portion extending from the element base portion toward a tape inner side of the fastener tape and having a smaller dimension in the tape thickness direction than the element base portion through a step portion,
• when, at a shoulder-port-side end portion of the slider body with the element guide passage into which the element rows are inserted, a cross-section orthogonal to a tape length direction of the fastener tape is viewed, a leading end portion of the fin portion is positioned on an outer side of the slider body with respect to an inner wall surface of the flange in a state in which a side surface of the element base portion of each of the fastener elements, the side surface facing outward in a left-right direction, is not in contact with the inner wall surface of the flange of the slider, and
• in a state in which a pair of the element rows are engaged with each other, when a maximum value of a dimension of two of the fastener elements that are engaged with each other in a tape width direction of the fastener tape is defined as an element maximum width and a total of dimensions of the fin portions of the two of the fastener elements in the tape width direction is defined as a total fin width, a ratio of the total fin width to the element maximum width is less than 40%.