Steering device comprising: an inner column; a hollow outer column that has an inner curved surface around an outer curved surface of the inner column so as to be capable of telescopic positioning and rotatably supports a steering shaft fitted with a steering wheel; a clamp unit that contracts and expands the inner curved surface of the outer column to clamp and unclamp the outer curved surface of the inner column at a specified telescopic adjustment position; a long hole that is formed in the outer column as long as a telescopic positioning range in an axial direction; a first through-hole that is formed in the inner column; a stopper provided for the long hole; and a second through-hole that is formed in the stopper and approximates to the first through-hole in diameter; characterized in that: the stopper includes an oval side plate and a bottom plate for covering a bottom face of the side plate; the second through-hole being formed in the bottom pate; the steering device further comprising a slide member made of resin and with a small friction coefficient, wherein the slide member is pressed and fixed around the side plate of the stopper, and wherein a lateral surface of the slide member is placed in contact with an inner surface of the long hole; and a pop rivet with a disk-shaped head section and that is inserted from an outer curved surface of the outer column into the second through-hole and the first through-hole, exposes its tip from an inner curved surface of the inner column, and expands the tip, wherein a spherically bulged section is formed, to fix the stopper to the outer curved surface of the inner column, the bulged section being strongly pressed against the inner curved surface of the inner column. an inner column; a hollow outer column that has an inner curved surface around an outer curved surface of the inner column so as to be capable of telescopic positioning and rotatably supports a steering shaft fitted with a steering wheel; a clamp unit that contracts and expands the inner curved surface of the outer column to clamp and unclamp the outer curved surface of the inner column at a specified telescopic adjustment position; a long hole that is formed in the outer column as long as a telescopic positioning range in an axial direction; a first through-hole that is formed in the inner column; a stopper provided for the long hole; and a second through-hole that is formed in the stopper and approximates to the first through-hole in diameter; the stopper includes an oval side plate and a bottom plate for covering a bottom face of the side plate; the second through-hole being formed in the bottom pate; the steering device further comprising a slide member made of resin and with a small friction coefficient, wherein the slide member is pressed and fixed around the side plate of the stopper, and wherein a lateral surface of the slide member is placed in contact with an inner surface of the long hole; and a pop rivet with a disk-shaped head section and that is inserted from an outer curved surface of the outer column into the second through-hole and the first through-hole, exposes its tip from an inner curved surface of the inner column, and expands the tip, wherein a spherically bulged section is formed, to fix the stopper to the outer curved surface of the inner column, the bulged section being strongly pressed against the inner curved surface of the inner column.