Double lockable sliders comprise a pair of first and second sliders reciprocatively mounted on the slide fastener and disposed reversely to each other. When the second pull tab is turned flat against the first pull tab, the engaging projection provided at the distal end and on one surface of the second pull tab comes into the recess formed in one surface of the first pull tab, and the prong provided at one end of the latch member resiliently comes into locking engagement with the indentation formed in one side of the engaging projection. The double lockable sliders further include cam means for imparting to the engaging projection upward motion when the latch member is pulled away from the second slider longitudinally of the slide fastener.