A column jacket includes a pair of facing portions facing each other, and a stepped portion which extends in a direction that intersects with a column axial direction and at which an outer surface of the corresponding facing portion projects outward halfway toward an end side of the column jacket. Tilt grooves are formed in respective side plates of an upper bracket fixed to a vehicle body. A clamping mechanism including a clamping shaft inserted through the tilt grooves clamps the side plates to bend the side plates such that an end of each side plate on the extending direction upper side is displaced toward the corresponding facing portion. The stepped portion is located between a fulcrum portion serving as a fulcrum when the corresponding side plate is bent by being clamped by the clamping mechanism and the corresponding tilt groove, in an extending direction of the side plates.