This safety ski binding includes a base plate adapted to be fastened to an upper side of the ski and supporting a vertical pivot. A sole plate is pivotably mounted on the vertical pivot and supports at its rear end a heel support having a sole support which is acted upon by a locking spring. The heel support includes a holding jaw at its front end. The sole plate is pushed by the locking spring in the direction of its central position.An additional release of the ski boot is provided by movement of the heel support relative to the sole plate, as in the case of a pure horizontal load. A heel support has a bearing block which is pivotable with its base about a vertical axial member. The vertical axial member of the bearing block is fastened to the sole plate. A further roller is allocated to the bearing block which is pressed by an additional spring against a cam disposed at the base plate.