A support bracket for supporting a steering column made by punching and bending a metal plate into a single piece having a left and right asymmetrical shape, and comprising: a base plate section that is provided in the width direction on a rear end section of the support bracket; a pair of left and right rear installation plate sections (16a, 16b) that are provided on both end sections in the width direction of the base plate section; a first extended section and a second extended section that extend forward from the edge on the front end of these rear installation plate sections (16a, 16b); a first side plate section that is bent upward from an edge on the inside in the width direction of the first extended section; a second side plate section that is bent upward from an edge on the outside in the width direction of the second extended section; a first front installation plate section that is provided in a state of being bent outward in the width direction from the edge on the top end of the first side plate section; a second front installation plate section that is provided in a state of being bent outward in the width direction from the edge on the top end of the second side plate section; characterized in that a first reinforcement plate section that extends downward toward the front from an edge on the front end of the first front installation plate section, and has an edge on the rear end that is continuous to the edge on the front end of the first front installation section by way of a bent section, and an edge on the end in the width direction that is continuous to an edge on the top end of the first side plate section by way of a bend section; and a second reinforcement plate section that extends downward toward the rear from an edge on the rear end of the second front installation plate section, and has an edge on the front end that is continuous to the edge on the rear end of the second front installation plate section by way of a bent section, and an edge on the end in the width direction that is continuous to an edge on the top end of the second side plate section by way of a bent section are provided. a base plate section that is provided in the width direction on a rear end section of the support bracket; a pair of left and right rear installation plate sections (16a, 16b) that are provided on both end sections in the width direction of the base plate section; a first extended section and a second extended section that extend forward from the edge on the front end of these rear installation plate sections (16a, 16b); a first side plate section that is bent upward from an edge on the inside in the width direction of the first extended section; a second side plate section that is bent upward from an edge on the outside in the width direction of the second extended section; a first front installation plate section that is provided in a state of being bent outward in the width direction from the edge on the top end of the first side plate section; a second front installation plate section that is provided in a state of being bent outward in the width direction from the edge on the top end of the second side plate section; characterized in that a first reinforcement plate section that extends downward toward the front from an edge on the front end of the first front installation plate section, and has an edge on the rear end that is continuous to the edge on the front end of the first front installation section by way of a bent section, and an edge on the end in the width direction that is continuous to an edge on the top end of the first side plate section by way of a bend section; and a second reinforcement plate section that extends downward toward the rear from an edge on the rear end of the second front installation plate section, and has an edge on the front end that is continuous to the edge on the rear end of the second front installation plate section by way of a bent section, and an edge on the end in the width direction that is continuous to an edge on the top end of the second side plate section by way of a bent section are provided.