Venturi ejector (1) comprising: - a duct (2) for supplying pressurized fluid extending along a central axis (Oy); - a first expansion chamber (3) connected to the supply duct (2); - a first mixing chamber (4) connected to the expansion chamber (3); - a first suction chamber (5) connected to the mixing chamber (4); - an exhaust chamber (6) connected to the first mixing chamber (4); characterized in that the pressurized fluid penetrates the first expansion chamber in a plurality of directions extending along a plane that is substantially orthogonal to the central axis (Oy). Vacuum generator comprising such an ejector.