It is disclosed a closing device comprising grip means (9) and hooking means (10) to be engaged with each other and relatively movable along an approaching trajectory (11), the hooking means (10) comprising at least one holding element (12) drivingly movable along a locking trajectory (13) transverse to the approaching trajectory (11) and provided with a side wall (14) for engagement with the grip means (9) which has a main stretch (14a) extending obliquely between the approaching trajectory (11) and locking trajectory (13) and a final stretch (14b) structured as a niche.
