Device for detecting vehicle gearbox selector rod position

Device (1) for detecting the position of a selector rod (2) for carrying out an action of selecting a gear row and an action of engaging/disengaging the selected gear in a vehicle gearbox, said rod (2) being able to move in axial translation for one of said actions and in angular rotation about its longitudinal axis (A) for another of said actions, said selector rod (2) also being able to adopt, for each gear row, a neutral position and two positions of gear engagement, said device (1) being characterized in that it comprises sensor means (3) provided with an angularly mobile activating member (4) and able to output a signal S correlated with the angular position (.beta.) of the activating member (4) and motion conversion means (5) interposed between said selector rod (2) and said activating member (4) to convert each of said movements of axial translation and of angular rotation of said selector rod (2) into a single rotary movement of said activating member (4).