furthermore the movable longitudinal wall portions 33 a and 33 b are bent inward so as to establish pressure contact with the upper jacket 32 thereby preventing relative movement this embodiment can also exert similar effects to the first embodiment since this embodiment applies the both end support type by providing the fixed longitudinal wall portions 41 a and 41 b and the movable longitudinal wall portions 33 a and 33 b respectively on both of right and left sides of the steering column 3 accordingly it is possible to further enhance support stiffness of the steering column 3 and thereby to improve and further stabilize the resonance frequency fig1 to fig1 show a steering column device 1 c according to a fourth embodiment of the present invention in the drawings the same constituents as those in the third embodiment are designated with the same reference numerals and duplicate description will be omitted herein as shown in fig1 to fig1 a key difference of the steering column device 1 c of this embodiment from the steering column device 1 b of the third embodiment is that similarly to the second embodiment the position of formation of the anteroposterior protrusion 12 is shifted to an upper end of the movable longitudinal wall portion 33 a and 33 b located above the center line c 1 passing through the center of the clamp bolt 7 a and 7 b and the clamp bolts 7 a and 7 b are located in the center of the contact portions 14 located in four positions this embodiment can also exert similar effects to the third embodiment according to this embodiment since the clamp bolts 7 a and 7.