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 and cyclically transfers the doses of tobacco contained inside the seats of a group standing still in the filling station; 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 (38, 39) 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 (38, 39). 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 and cyclically transfers the doses of tobacco contained inside the seats of a group standing still in the filling station; 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 (38, 39) 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 (38, 39). 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 (38, 39).