Abstract: A device for automatic binding of a sporting good on a corresponding boot representing an axial immobilization mechanism capable of cooperating with a corresponding notch arranged transversely on a binding body affixed to the sporting good and including an associated latch that can be activated from a latching position of the immobilization mechanism of the boot and vice versa, by way of a control device arranged on the binding body, and acting on the latch. The latching or unlatching control device of the latch are constituted by a knuckle joint type system acting on the immobilization mechanism of the boot and activated by one of the ends of the latter. The immobilization mechanism is arranged transversely in an intermediate zone of the sole of the boot, located between its two ends.