A telescopic steering apparatus, comprising a telescopic steering column, a steering shaft, a fixed bracket configured to be fixed to a vehicle body, a movable bracket (22c, 22d), a rod member, and an adjusting lever, wherein the steering column comprises a cylindrical outer column (12c, 12d, 12e, 12f, 12g, 12h), at least a portion of which in an axial direction having an enlargeable and reducible inner diameter, and a cylindrical inner column arranged radially inside the outer column (12c, 12d, 12e, 12f, 12g, 12h), the outer column (12c, 12d, 12e, 12f, 12g, 12h) and the inner column being configured to be telescopically combined, and an inner peripheral surface of the outer column (12c, 12d, 12e, 12f, 12g, 12h) having a supporting portion (36, 36a), which has a plurality of protuberances (39, 39a, 39b, 39c) formed on an inner peripheral surface of the outer column (12c, 12d, 12e, 12f, 12g, 12h), to which the inner column (11 c) is fitted and is arranged to support the inner column (11 c) such that the inner column is axially displaceable, wherein the steering shaft is rotatably supported radially inside the steering column, and has a rear end portion protruding rearward from a rear end opening of the steering column and configured such that a steering wheel is attached thereto, wherein the fixed bracket includes a pair of side wall portions provided at a fixed part so as to hold the portion of the outer column (12c, 12d, 12e, 12f, 12g, 12h) having the enlargeable and reducible inner diameter from both sides in a width direction, the pair of side wall portions being displaceable toward and away from each other in the width direction, wherein the movable bracket (22c, 22d) has a pair of clamped portions (23b, 23c) formed integrally with the outer column (12c, 12d, 12e, 12f, 12g, 12h) by plastic forming, the pair of clamped portions (23b, 23c) being displaceable toward and away from each other in the width direction in accordance with a displacement of the pair of side wall portions toward and away from each other in the width direction, wherein the rod member is arranged in the width direction such that the rod member is inserted into vehicle body side through-holes formed through the pair of side wall portions at locations aligned with each other and column side through-holes (24a, 24b) formed through the pair of clamped portions (23b, 23c), and is configured to widen or to narrow a gap between a pair of surfaces of the pair of side wall portions opposed to each other, wherein the adjusting lever is provided at a base end portion of the rod member, and is configured to widen or to narrow the gap between the pair of surfaces by a rotation of the adjusting lever, wherein the inner peripheral surface of the outer column (12c, 12d, 12e, 12f, 12g, 12h) has a shock absorbing portion (40, 40a, 40b, 40c) at a location shifted toward a rear side in the axial direction from an axial rear end face of the inner column, the shock absorbing portion (40, 40a, 40b, 40c) having protuberances (41, 41a, 41b, 41c) that are formed to protrude radially inwards from the inner peripheral surface, a diameter (R 40) of an inscribed circle of the protuberances (41, 41a, 41b, 41c) of the shock absorbing portion (40, 40a, 40b, 40c) being smaller than an outer diameter of the inner column, wherein the outer column (12c, 12d, 12e, 12f, 12g, 12h), including the supporting portion (36, 36a) and the shock absorbing portion (40, 40a, 40b, 40c), is formed by expanding a hollow pipe radially outwards, and wherein the movable bracket (22c, 22d) is formed integrally with the outer column (12c, 12d, 12e, 12f, 12g, 12h) by an expansion forming.