Heel piece for ski-touring bindings, comprising a base piece (10) fixed to the ski, a slide (20) joined to said base piece and displaceable relative thereto in the longitudinal direction (X-X), wherein said slide has, formed thereon, a body (24) which contains the means (30) for resilient reaction of the heel piece and which has, pivotably mounted thereon, a first rear lever (120) for operating the heel piece, rotationally movable between different working positions, and a front fork (110) engageable with the heel (1a) of a boot (1), in turn movable rotationally between different working positions, said front fork (110) comprising two arms (111) each of which has a free upper end in the form of a hook (112) designed to engage with a corresponding pin (1b) on the heel (1a) of the boot (1).