with a bracket 4 a in a preferred embodiment the bracket 4 a is integrally formed at the external surface of the external cylinder 4 and attached to the shroud 1 by way of a screw 12 the internal cylinder 5 is mounted at the steering column 2 with a bracket 5 a that is integrally formed around the internal surface of the internal cylinder 5 the bracket 5 a of the internal cylinder 5 is formed to prevent the internal cylinder 5 from rotating against the steering column 2 however in a preferred embodiment the internal cylinder 5 is not fixed in an instrumental manner the attachment of the plurality of brackets 5 a to the external circumference of the steering column 2 effectively prevents rotation of the internal cylinder 5 around the steering column 2 in a further preferred embodiment the fixing state switch includes an actuator 8 having a rod 8 a that is inserted by way of an internal solenoid effect when power is supplied to the steering column 2 furthermore holes 7 a and 7 b are formed through the external and internal cylinders 4 and 5 respectively for insertion of the rod 8 a while power is not supplied to the actuator 8 also a switching means is provided that.