A piston-operated dispenser unit for confectionery food products, comprising (I) a door (4) mountable on a dispensing mouth (5) of a machine (2) for making and instantaneously dispensing confectionery products; (II) at least one dispensing tap (9), in turn comprising a main body (10), extending frontally from the door (4) and forming, inside the door (4), an outflow duct (11) for the product to be dispensed, and a piston (13), slidably mounted inside the duct (11) and mobile between an open position and a closed position of the duct (11); (III) a manually operated lever (17), connected to the piston (13) for moving the piston (13) between the open position and the closed position of the duct (11), and vice versa; and (IV) a spring (24) operating on the piston (13) to apply an action for keeping the piston (13) in the closed position.