The telescoping mechanism of the steering column includes a plurality of balls (17) which are rotatably fixed on the peripheral surface of a ring member (13) which is fixedly mounted on a steering shaft provided with a steering wheel. The balls are positioned along an imaginary helical line on the peripheral surface of the ring member. The ring member with the balls are fitted in a sleeve (30) formed at its inner peripheral surface with a helical groove (32), in such a manner that the balls are movably fitted in the helical groove. The sleeve is axially fixed to a movable bracket. The ring member is driven through a gear mechanism (31, 33) by an electric motor (36), thus axially displacing the steering shaft relative to the sleeve. The tilt mechanism of the steering column includes a screw (58) movably connecting the movable bracket (19) and a fixed bracket (52) fixed to a vehicle body. The tilt screw is threadedly inserted in a nut structure (62) rotatably fixed relative to the fixed bracket. The nut structure is driven through a gear mechanism by an electric motor (83), thereby axially displacing the tilt screw thus to push up the movable bracket.
