A labeling machine having a device for applying labels to containers to be labeled, the application device being fed by a feeding unit supported by a base frame and including at least one device for supporting a spool of a film of labels which is arranged around a hollow tubular body. The supporting device includes at least one base body supported by the base frame and an elongated body which can be associated removably with the base body by virtue of a removable connecting component, the elongated body being insertable into the hollow tubular body of the spool when separated from the base body. Locking components are further provided which are adapted to lock the elongated body in the tubular body with the elongated body separated from the base body.