An adjustable pedal unit for a motor vehicle includes a first plate onto which are mounted at least the accelerator pedal (2) and the footbrake pedal (3). The plate is mounted slidingly onto longitudinal guides inclined upwardly and forwardly, so that in the most withdrawn position (referring to motor vehicle driving direction) of the pedal unit, the pedals are placed in a lower position. Conversely, in the most forward position of the pedal unit, the pedals are paced in a higher position. The driver's heels rest on a second plate (2) moving longitudinally together with the first plate (1) when the latter is adjusted in position, however always on a basically horizontal plane. An auxiliary footboard may be provided for resting the foot that does not actuate the accelerator and footbrake pedal (2, 3).