To achieve a structure capable of stably holding an inner column, on the inner diameter side of an outer column.

The outer column 13d and a movable side bracket 22b are molded by integrally swelling by a hydroforming construction method or the like. Respective protrusion parts 23a and 23a for constituting a support part 26 of the outer column 13d and an outer peripheral surface of the inner column 14c are allowed to abut only in three places in the circumferential direction. Projection parts 31 are arranged around intermediate parts in the axial direction of column side through-holes 30 in outside surfaces in the width direction of sandwiching object plate parts 25a and 25a of the movable side bracket 22b in a state of projecting in the width direction from the both width directional outside surfaces. Inside surfaces in the width direction of support plate parts 28 and 28 of a fixed side bracket 12b and the outside surfaces in the width direction of the projection parts 31 are allowed to abut on each other in an assembling state.