The invention concerns a cleaning device (5) for an optical sensor (9) module (3) of a motor vehicle comprising a housing (7), an optical sensor (9) housed in the housing (7), characterised in that the cleaning device (5) comprises a cylindrical flange (21) having first snap-fastening members (23) shaped to engage with second snap-fastening members (25) carried by the sensor (9) module (3), the first (23) and second (25) snap-fastening members being configured such that, in the mounted state, the axis of the cylindrical flange (21) merges with the optical axis (A) of the optical sensor (9), and at least one pipe (35; 37) having spray openings (350; 370) is attached to the inner wall (33) of the cylindrical flange (21), the spray openings (350; 370) being turned towards the optical sensor (9).