a very small pre compression force in a reference circumferential position origional angular position of fig7 which will be described the first bearing surfaces 116a 116b are coplanar with the corresponding second bearing surfaces 120a 120b a stopper pin 127 is inserted through the through hole 118 formed in the shaft portion 117 of the first steering shaft 1 and through the through holes 123 formed in the tubular portion 122 of the second steering shaft 3 the stopper pin 127 has opposite end portions having a diameter equal to the diameter d1 of the through holes 123 and an intermediate portion having a diameter d2 which is smaller than d1 by a predetermined value u03b4d the end portions of the stopper pin 127 fit snugly in the through holes 123 in this arrangement there exists a smaller clearance between the inner surface of the through hole 118 and the outer surface of the intermediate portion of the stopper pin 127 accordingly the pin 127 and the through holes 118 123 permit a relative angular displacement of the first and second steering shafts 1 3 within a range corresponding to one half the difference u03b4d in diameter between d1 and d2 in other words the pin 127 shaft portion 117 and the tubular portion 122 cooperate to provide stop means for limiting a maximum angle of relative rotation.