Abstract: Safety fastenings for snowboards are mounted transversally with respect to the longitudinal axis of the board, characterised by the fact that they are provided with interdependent automatic releases, connecting two twin fastenings. The releases are brought into the "active" position i.e. with fastenings fixing the skier's ski boots and are provided with an actuating element such as a lever or a push button placed under the sole of each ski boot, which by means of mechanical, hydraulic or pneumatic connectors, is connected to the releases. The actuating elements are subject to the weight of the skier and remain in an inactive position when pressed but cause the opening of the twin fastening immediately if, for any reason, the pressure transmitted by a ski boot ceases.