Safety binding for the practice of ski touring, including a baseplate having a rear end and a front end, the baseplate being adapted to be pivotally mounted relative to a ski; a rear base adapted to be fixed to the ski; a heel lift capable of taking at least a support position in which the heel lift limits the rotation of the baseplate, and a storage position in which the heel lift does not limit the rotation of the baseplate; and a mechanism enabling the baseplate to be alternatively fixed to and released from the rear base. The mechanism includes a locking device capable of switching from a first closed position to a second open position. The binding also includes a release member having an actuation surface adapted to be manipulated by the user, the bias of the actuation surface thereof driving the locking device toward the second open position; and a return member biases the locking device toward their first closed position. The first closed position of the locking device is the only stable position of the mechanism.