A filling unit for a manufacturing machine for the production of disposable cartridges for electronic cigarettes; the filling unit comprises: a cylindrical-shaped tank , which is arranged horizontally, is mounted so as to rotate in a stepwise manner around a vertical rotation axis , is delimited, at the bottom, by a base disc having a circular shape, and is delimited, on the sides, by a cylindrical side wall , which projects from the base disc in a perpendicular manner; a feeding duct which has an outlet opening arranged inside the tank so as to feed a flow of tobacco into the tank , which forms a bed resting on the base disc of the tank ; a plurality of groups of seats , each of which is obtained in the base disc and is adapted to receive and contain a corresponding dose of tobacco; a transfer device which is arranged in a fixed position at a filling station (S2) and cyclically transfers the doses of tobacco contained inside the seats of a group standing still in the filling station (S2); a scraper element , which is arranged inside the tank in a fixed position immediately upstream of the transfer device relative to the rotation direction of the tank ; and a deviating wall which is arranged inside the tank in a fixed position upstream of the scraper element relative to the rotation direction of the tank , is independent and separate from the scraper element , and is adapted to interfere with the tobacco present inside the tank so as to define preferential and/or forced passage paths for the tobacco ; the filling unit is characterized in that: the scraper element is in contact with the base disc so that the tobacco cannot pass under the scraper element , and fulfils the function of pushing away the tobacco that rests on the base disc on the outside of the seats ; and there are provided a series of said deviating walls . a cylindrical-shaped tank , which is arranged horizontally, is mounted so as to rotate in a stepwise manner around a vertical rotation axis , is delimited, at the bottom, by a base disc having a circular shape, and is delimited, on the sides, by a cylindrical side wall , which projects from the base disc in a perpendicular manner; a feeding duct which has an outlet opening arranged inside the tank so as to feed a flow of tobacco into the tank , which forms a bed resting on the base disc of the tank ; a plurality of groups of seats , each of which is obtained in the base disc and is adapted to receive and contain a corresponding dose of tobacco; a transfer device which is arranged in a fixed position at a filling station (S2) and cyclically transfers the doses of tobacco contained inside the seats of a group standing still in the filling station (S2); a scraper element , which is arranged inside the tank in a fixed position immediately upstream of the transfer device relative to the rotation direction of the tank ; and a deviating wall which is arranged inside the tank in a fixed position upstream of the scraper element relative to the rotation direction of the tank , is independent and separate from the scraper element , and is adapted to interfere with the tobacco present inside the tank so as to define preferential and/or forced passage paths for the tobacco ; the filling unit is characterized in that: the scraper element is in contact with the base disc so that the tobacco cannot pass under the scraper element , and fulfils the function of pushing away the tobacco that rests on the base disc on the outside of the seats ; and there are provided a series of said deviating walls . the scraper element is in contact with the base disc so that the tobacco cannot pass under the scraper element , and fulfils the function of pushing away the tobacco that rests on the base disc on the outside of the seats ; and there are provided a series of said deviating walls . <EOS>