Asteering column support apparatus comprises: a bracket (11a-11f) on the vehicle side that is made using metal plate, is fastened to a vehicle body in at least two locations on both sides in the width direction, does not displace in the forward direction during a secondary collision, and has a locking cutout section (27, 27a, 40, 44a, 44b, 56) that extends in the forward/ backward direction that is formed in between the two locations on both sides; and a bracket (12b-12d) on the column side that is made using metal plate, is located under the bracket on the vehicle side, supports the steering column, and has a top plate section (23, 23a, 23b) in the top end section that has a width dimension that is greater than the width dimension of the locking cutout section; characterized in that the steering column support apparatus further comprises: a sliding member (28, 28a, 28b) having a pair of top and bottom sliding plate sections (31a-31e) each having a width dimension that is greater than the width dimension of the locking cutout section and arranged such that both end sections in the width direction of these sliding plate sections hold portions of the bracket on the vehicle side located on both sides of the locking cutout section from both the top and bottom sides; and a fastening member (29, 30, 60, 61) that is inserted in the up/down direction through the sliding member and has a restraining portion on the top end side, and the sliding member and the fastening member are located on the rear end section of the locking cutout section, and by holding the portions of the bracket on the vehicle side between the restraining portion and the top plate section by way of the pair of sliding plate sections, the bracket on the column side is supported by the bracket on the vehicle side so as to be able to break away in the forward direction due to an impact load that is applied during a secondary collision. a bracket (11a-11f) on the vehicle side that is made using metal plate, is fastened to a vehicle body in at least two locations on both sides in the width direction, does not displace in the forward direction during a secondary collision, and has a locking cutout section (27, 27a, 40, 44a, 44b, 56) that extends in the forward/ backward direction that is formed in between the two locations on both sides; and a bracket (12b-12d) on the column side that is made using metal plate, is located under the bracket on the vehicle side, supports the steering column, and has a top plate section (23, 23a, 23b) in the top end section that has a width dimension that is greater than the width dimension of the locking cutout section; characterized in that the steering column support apparatus further comprises: a sliding member (28, 28a, 28b) having a pair of top and bottom sliding plate sections (31a-31e) each having a width dimension that is greater than the width dimension of the locking cutout section and arranged such that both end sections in the width direction of these sliding plate sections hold portions of the bracket on the vehicle side located on both sides of the locking cutout section from both the top and bottom sides; and a fastening member (29, 30, 60, 61) that is inserted in the up/down direction through the sliding member and has a restraining portion on the top end side, and the sliding member and the fastening member are located on the rear end section of the locking cutout section, and by holding the portions of the bracket on the vehicle side between the restraining portion and the top plate section by way of the pair of sliding plate sections, the bracket on the column side is supported by the bracket on the vehicle side so as to be able to break away in the forward direction due to an impact load that is applied during a secondary collision. a sliding member (28, 28a, 28b) having a pair of top and bottom sliding plate sections (31a-31e) each having a width dimension that is greater than the width dimension of the locking cutout section and arranged such that both end sections in the width direction of these sliding plate sections hold portions of the bracket on the vehicle side located on both sides of the locking cutout section from both the top and bottom sides; and a fastening member (29, 30, 60, 61) that is inserted in the up/down direction through the sliding member and has a restraining portion on the top end side, and the sliding member and the fastening member are located on the rear end section of the locking cutout section, and by holding the portions of the bracket on the vehicle side between the restraining portion and the top plate section by way of the pair of sliding plate sections, the bracket on the column side is supported by the bracket on the vehicle side so as to be able to break away in the forward direction due to an impact load that is applied during a secondary collision.