Abstract: In order to simplify and facilitate gear shifting, the present gear shifting device is equipped with a side position cylinder (2a,202) with a piston rod (11,203), which is connected to the shifter of the gearbox and movable to different predetermined positions for adjusting the shifter to a side position point corresponding to the selected gear, and a shift point cylinder (2b,204) with a piston rod (14,205), which is connected to the shifter of the gearbox and movable to different positions for moving the shifter to a shift point corresponding to the selected gear by swinging the shifter in one direction or the other, and provision is made to prevent the movement of the piston rods until declutching has taken place and to prevent return of the clutch to traction position until the gear has been engaged in the gearbox.