Abstract: A retractable running board (A) comprising at least one supplementary step that facilitates getting in/out of a vehicle (B) for the passengers, e.g. in vehicles (B) with high ground clearance, at least one driving member supplying the driving force required by the system, at least one drive shaft, at least two flanges in at least one of which said driving shaft is embedded, at least two levers that are engaged with said flanges and capable of performing rotational movement in y axis (y) perpendicular to the ground upon being actuated by the drive shaft, at least one intermediate lever, and at least two step brackets which are secured in said supplementary step and which, at the other end of the lever which is fixed to the flange, are capable of performing rotational movement in y axis (y) perpendicular to the ground relative to each other.