A steering column device includes: a steering shaft (5); a steering column; a vehicle body mounting bracket (1); one of the pair of the clamping pieces (8) including a slit (9a) which has a substantially U-shape, and which surrounds one of a front side and a rear side of the tilt hole (10), and an upper side and a lower side of the tilt hole, and a tongue piece portion (9) which is surrounded by the slit (9a), the tilt hole (10) being positioned at a tip end side of the tongue piece portion (9), and at least the one of the clamping pieces (8) including the slit (9a), including a reinforcement portion (75, 76, 77, 78) which surrounds an outside of the slit (9a), and which is Integrally provided with the one of the clamping pieces (8) including the slit (9a).