A slider (10) for a slide fastener having a slider body (11) and a handle (12) of which one end is supported by a pivot supporting portion (11-8) on an upper surface of the slider body (11), wherein a window portion is formed in a handle main body (12-3) of the handle (12), wherein a pair of left and right cantilever engagement pieces (12-5) are disposed to extend from one of inner edge portions of the window portion toward a facing inner edge portion, and wherein a handle attachment/detachment column part (11-8) having an attachment/detachment head (11-8b) which is attached to or detached from the pair of the left and right cantilever engagement pieces (12-5) in a snapped shape is disposed to protrude at least at a rear opening slide on the upper surface of the slider body (11),
wherein the pair of the left and right cantilever engagement pieces (12-5) have engagement portions with respect to the attachment/detachment head (11-8b) at facing inner side surfaces thereof,
in the engagement portion, at least a free end portion of each of the pair of the left and right cantilever engagement pieces (12-5) is formed to have a slanted plane (12-9) which is slanted downward with respect to the facing plane, and
the engagement portions are configured to have a head receiving space (PS) which receives the attachment/detachment head (11-8b) at the time of engaging each of the cantilever engagement pieces (12-5) with the attachment/detachment head (11-8b).