There is described a sterilizing unit (1) for sterilizing caps (2) to be applied onto respective containers (19), comprising: feeding means (4) for individually feeding caps (2) along a path (P) and a sterilizing station (5) arranged along path (P) and adapted to cause the interaction of a sterilizing agent with caps (2) so as to sterilize caps (2) sterilizing station (5) comprises a compartment (6) filled with a bath (7) of sterilizing agent and through which feeding means (4) individually feed caps (2).
