A support bracket for steering apparatus comprising: an installation section enabling to be fixed to a vehicle body; and a pair of support plate sections (22a-22c) arranged separately and oppositely from each other in a width direction of the vehicle body, and respectively comprising an upper end section connected to a bottom surface of the installation section and a fixed-side through hole; wherein the installation section comprises an installation plate section (54, 54a-54e) having a bridge plate section (55, 55a, 55b) and a pair of side plate sections (56, 56a,56b) provided on both sides of the bridge plate section (55, 55a, 55b) in the width direction of the vehicle body, wherein each of the pair of the support plate sections (22a-22c) further comprises a supporting plate body (64, 64a, 64b), a reinforcing member (65, 65a-65f), a lug section (66, 66a), and a slit (72, 90), wherein the supporting plate bodies (64, 64a, 64b) of the pair of the support plate sections (22a-22c) are composed of plate members that are parallel in the up-down direction and have a pair of tilt adjustment long holes that extend in the up-down direction in sections that are oppositely located to each other with respect to the width direction, the reinforcing member (65, 65a-65f) is provided in at least one of positions that are shifted to a front side or a rear side than the fixed-side through hole of each of the pair of support plate sections (22a-22c), the reinforcing member (65, 65a-65f) extending in an up-down direction, and comprising an upper end edge as a free end, characterized in that the lug section (66, 66a) is provided on the upper side of the supporting plate body (64, 64a, 64b) and the reinforcing member (65, 65a-65f) so as to incline in a direction toward inside in the width direction as going upward, the lug section (66, 66a) is welded to the outer end sections in the width direction of the lower side surface of the bridge plate section (55, 55a, 55b), a section of the lower edge of the lug section (66, 66a) that is aligned with the supporting plate body (64, 64a, 64b) in the forward-backward direction is connected to an upper end edge of the supporting plate body (64, 64a, 64b), and the slit (72, 90) is arranged in the forward-backward direction and open on both ends in the width direction of the vehicle body, and is provided between a section of a lower end edge of the lug section (66, 66a) that is aligned with the reinforcing member and the upper end edge of the reinforcing member, and the lower end edge of the lug section (66, 66a) and the upper end edge of the reinforcing member is separated and are not continuous. an installation section enabling to be fixed to a vehicle body; and a pair of support plate sections (22a-22c) arranged separately and oppositely from each other in a width direction of the vehicle body, and respectively comprising an upper end section connected to a bottom surface of the installation section and a fixed-side through hole; wherein the installation section comprises an installation plate section (54, 54a-54e) having a bridge plate section (55, 55a, 55b) and a pair of side plate sections (56, 56a,56b) provided on both sides of the bridge plate section (55, 55a, 55b) in the width direction of the vehicle body, wherein each of the pair of the support plate sections (22a-22c) further comprises a supporting plate body (64, 64a, 64b), a reinforcing member (65, 65a-65f), a lug section (66, 66a), and a slit (72, 90), wherein the supporting plate bodies (64, 64a, 64b) of the pair of the support plate sections (22a-22c) are composed of plate members that are parallel in the up-down direction and have a pair of tilt adjustment long holes that extend in the up-down direction in sections that are oppositely located to each other with respect to the width direction, the reinforcing member (65, 65a-65f) is provided in at least one of positions that are shifted to a front side or a rear side than the fixed-side through hole of each of the pair of support plate sections (22a-22c), the reinforcing member (65, 65a-65f) extending in an up-down direction, and comprising an upper end edge as a free end, characterized in that the lug section (66, 66a) is provided on the upper side of the supporting plate body (64, 64a, 64b) and the reinforcing member (65, 65a-65f) so as to incline in a direction toward inside in the width direction as going upward, the lug section (66, 66a) is welded to the outer end sections in the width direction of the lower side surface of the bridge plate section (55, 55a, 55b), a section of the lower edge of the lug section (66, 66a) that is aligned with the supporting plate body (64, 64a, 64b) in the forward-backward direction is connected to an upper end edge of the supporting plate body (64, 64a, 64b), and the slit (72, 90) is arranged in the forward-backward direction and open on both ends in the width direction of the vehicle body, and is provided between a section of a lower end edge of the lug section (66, 66a) that is aligned with the reinforcing member and the upper end edge of the reinforcing member, and the lower end edge of the lug section (66, 66a) and the upper end edge of the reinforcing member is separated and are not continuous.