Provided is a slide fastener slider that improves workability when attaching a handle holder to a slider body, has strong attachment strength, and a good appearance. The handle holder (40) has: flanges (41) that extend in the length direction, and extend in the width direction from the left and right sides of a fixed-side base end (43); and a protruding part (42) that protrudes toward the slider body (20). The slider body (20) has: sliding grooves (29) that are formed on the front end of an upper winged plate (21), and accommodate the flanges (41); and a recess (30) that engages with the protruding part (42). By inserting the flanges (41) into the sliding grooves (29), and crimping the upper surface (21b) of the upper winged plate (21), which is positioned above the sliding grooves (29), toward the flanges (41), the protruding part (42) is forced to engage with the recess (30), and the handle holder (40) is fixed to the slider body (20).