A vacuum pump includes a cylinder. The cylinder includes an inner casing forming two transversely intersected, parallel cylindrical chambers, the axes of which rest in one plane, and one of the faces of which represents a wall on which a suction hole inlet is located. The cylinder also includes an outer casing disposed around the inner casing to form a confined space, provided with the inlet and an outlet, which allows a liquid to be circulated. Two pump rotors are situated in the parallel cylindrical chambers and are driven in rotation by an electric motor. A drive housing contains the motor and components for driving and synchronizing the pump rotors supporting the rotors by cantilever and serving as support and centering with respect to the cylinder. The drive housing includes two extended supports that are integrally constructed as one piece. First and second guide elements guide rotation of the rotors, which guide elements support the rotors by cantilever, wherein the first guide elements are situated at the ends of the two extended supports.