A vehicle dashboard has a fixed structure provided with an outer surface, facing a passenger compartment, and a housing having an opening at said outer surface; the dashboard further has a supporting device provided with a frame, which has a seat for supporting a portable electronic device and is movable between an operative position, in the passenger compartment, and a stowed position, in the housing; the dashboard has a blocking device for retaining the frame in the stowed position; the blocking device is activated/deactivated automatically in response to a signal which is indicative of an authorized closing/opening control executed to close/open the lock of at least one of the side doors of the vehicle.