Automated heel holder device (1, 101) for a ski binding, in particular a touring ski binding, comprising: a) a base unit (2, 102) for fastening to the surface of a ski; b) a heel holder (3, 103) having at least one holding means (31.1, 31.2, 131.2) for holding a ski boot in a heel region of the ski boot, wherein the automated heel holder device (1, 101) has a holding configuration in which the heel holder (3, 103) is situated in a holding position and the at least one holding means (31.1, 31.2, 131.2) can interact with the heel region of the ski boot that is held in the ski binding in such a manner that the heel region of the ski boot is held in a lowered position; c) a radial bearing by way of which the heel holder (3, 103) is mounted on the base unit (2, 102) so as to be pivotable, relative to the base unit (2, 102), about a geometrical pivot axis (7, 107) that is aligned so as to be substantially vertical and, proceeding from the holding position of said heel holder (3, 103), is thus pivotable about the pivot axis (7, 107) along a displacement path away from the holding position of said heel holder (3, 103), wherein the radial bearing has a pin (27, 127) which is configured on a first of the two units of base unit (2, 102) and heel holder (3, 103), and the radial bearing has a receptacle which is configured on a second of the two units of base unit (2, 102) and heel holder (3, 103), wherein the pin (27, 127) is inserted into the receptacle so as to be rotatable, on account of which the heel holder (3, 103) is mounted on the base unit (3, 103) so as to be pivotable, relative to the base unit (3, 103), about the pivot axis (7, 107); and d) a pre-tensioning installation by way of which the heel holder (3, 103), in a first region of the displacement path, is capable of being pretensioned towards the holding position of said heel holder (3, 103), wherein the pre-tensioning installation comprises an impact element (61, 161), having a positioning structure, and an elastic element (62.1, 62.2, 162), wherein the impact element (61, 161), by way of a force generated by the elastic element (62.1, 62.2, 162) is capable of being pushed against the pin (27, 127), on account of which the positioning structure is capable of being pushed against a counter-structure assigned to the pin (27, 127), when the heel holder (3, 103) is situated in the first region of the displacement path, so as to pre-tension the heel holder (3, 103) in the first region of the displacement path towards the holding position of said heel holder (3, 103), wherein the impact element (61, 161) has two arms (64.1, 64.2), wherein one of the two arms (64.1, 64.2) is in each case disposed on either side of the positioning structure; characterized in that the two arms (64.1, 64.2) on opposite sides of the pin (27, 127) reach from the positioning structure up to a side of the pivot axis (7, 107) that faces away from the positioning structure. a) a base unit (2, 102) for fastening to the surface of a ski; b) a heel holder (3, 103) having at least one holding means (31.1, 31.2, 131.2) for holding a ski boot in a heel region of the ski boot, wherein the automated heel holder device (1, 101) has a holding configuration in which the heel holder (3, 103) is situated in a holding position and the at least one holding means (31.1, 31.2, 131.2) can interact with the heel region of the ski boot that is held in the ski binding in such a manner that the heel region of the ski boot is held in a lowered position; c) a radial bearing by way of which the heel holder (3, 103) is mounted on the base unit (2, 102) so as to be pivotable, relative to the base unit (2, 102), about a geometrical pivot axis (7, 107) that is aligned so as to be substantially vertical and, proceeding from the holding position of said heel holder (3, 103), is thus pivotable about the pivot axis (7, 107) along a displacement path away from the holding position of said heel holder (3, 103), wherein the radial bearing has a pin (27, 127) which is configured on a first of the two units of base unit (2, 102) and heel holder (3, 103), and the radial bearing has a receptacle which is configured on a second of the two units of base unit (2, 102) and heel holder (3, 103), wherein the pin (27, 127) is inserted into the receptacle so as to be rotatable, on account of which the heel holder (3, 103) is mounted on the base unit (3, 103) so as to be pivotable, relative to the base unit (3, 103), about the pivot axis (7, 107); and d) a pre-tensioning installation by way of which the heel holder (3, 103), in a first region of the displacement path, is capable of being pretensioned towards the holding position of said heel holder (3, 103), wherein the pre-tensioning installation comprises an impact element (61, 161), having a positioning structure, and an elastic element (62.1, 62.2, 162), wherein the impact element (61, 161), by way of a force generated by the elastic element (62.1, 62.2, 162) is capable of being pushed against the pin (27, 127), on account of which the positioning structure is capable of being pushed against a counter-structure assigned to the pin (27, 127), when the heel holder (3, 103) is situated in the first region of the displacement path, so as to pre-tension the heel holder (3, 103) in the first region of the displacement path towards the holding position of said heel holder (3, 103), wherein the impact element (61, 161) has two arms (64.1, 64.2), wherein one of the two arms (64.1, 64.2) is in each case disposed on either side of the positioning structure;