A steering column is structured such that a clamp/unclamp mechanism of a telescopic mechanism and a tilting mechanism can be operated by a single control lever located in the vicinity of a steering wheel, and that no part juts out of the steering column to improve reliability and controllability. When the control lever is pulled to rock on the center of the lever center axis, a tilt head is unclamped, while the rocking motion of the control lever turns a pusher plate, thereby pushing a pusher rod and also turning a column clamp shaft through a rocking arm. With the rotation of the column clamp shaft, the clamp is released to allow a column head to move. Since the column clamp shaft turns parallelly with the direction of movement of the column head, the column head can be clamped/unclamped regardless of its position.