A steering column device, comprising: a lower jacket including a plate-shaped bottom wall arranged in a horizontal direction and a pair of upstanding walls upstanding in a vertical direction, thereby being formed into an upward U shape; an upper jacket including a pair of vertical walls along the vertical direction and a pair of horizontal walls along the horizontal direction, thereby providing a substantially rectangular-cylindrical shaped cross section, the upper jacket being arranged movably with respect to the lower jacket along a vehicle longitudinal direction; a distance bracket arranged in the upper jacket to have telescopic slots each constituted by a through-hole which opens along the vehicle longitudinal direction; an operating shaft penetrating through the pair of upstanding walls; a lock mechanism disposed on the operating shaft; telescopic guide holes provided in either one of the pair of upstanding walls and the pair of vertical walls and also each constituted by a through-hole which opens along the vehicle longitudinal direction; co-fastening pins provided on the other of the pair of upstanding walls and the pair of vertical walls to penetrate through the telescopic guide holes movably in the telescopic guide holes and also configured to fasten the one of the pair of upstanding walls and the pair of vertical walls so that the vertical walls can move on the upstanding walls; and an attachment bracket including an attachment body arranged in the horizontal direction and a pair of hanging parts hanging from the attachment body, thereby being formed into a downward U shape, wherein the lower jacket is pivotally supported by the attachment bracket, whereby the lower jacket and the attachment bracket form a box-shaped cross section, characterized in that the upper jacket is arranged in the lower jacket, the operating shaft penetrates through the telescopic slots, and the lock mechanism is configured so as to narrow an interval between the pair of upstanding walls by rotating the operating shaft about an axis thereof in a fastening direction, thereby bringing the lower jacket into pressure contact with the distance bracket. a lower jacket including a plate-shaped bottom wall arranged in a horizontal direction and a pair of upstanding walls upstanding in a vertical direction, thereby being formed into an upward U shape; an upper jacket including a pair of vertical walls along the vertical direction and a pair of horizontal walls along the horizontal direction, thereby providing a substantially rectangular-cylindrical shaped cross section, the upper jacket being arranged movably with respect to the lower jacket along a vehicle longitudinal direction; a distance bracket arranged in the upper jacket to have telescopic slots each constituted by a through-hole which opens along the vehicle longitudinal direction; an operating shaft penetrating through the pair of upstanding walls; a lock mechanism disposed on the operating shaft; telescopic guide holes provided in either one of the pair of upstanding walls and the pair of vertical walls and also each constituted by a through-hole which opens along the vehicle longitudinal direction; co-fastening pins provided on the other of the pair of upstanding walls and the pair of vertical walls to penetrate through the telescopic guide holes movably in the telescopic guide holes and also configured to fasten the one of the pair of upstanding walls and the pair of vertical walls so that the vertical walls can move on the upstanding walls; and an attachment bracket including an attachment body arranged in the horizontal direction and a pair of hanging parts hanging from the attachment body, thereby being formed into a downward U shape, wherein the lower jacket is pivotally supported by the attachment bracket, whereby the lower jacket and the attachment bracket form a box-shaped cross section, characterized in that the upper jacket is arranged in the lower jacket, the operating shaft penetrates through the telescopic slots, and the lock mechanism is configured so as to narrow an interval between the pair of upstanding walls by rotating the operating shaft about an axis thereof in a fastening direction, thereby bringing the lower jacket into pressure contact with the distance bracket.