A structure of a steering support portion, comprising: a steering support member configured so as to extend in approximately a direction of a width of a vehicle, so as to be capable of connecting right and left panels of the vehicle, and so as to be positioned within an instrument panel; front and back column brackets (22, 23) configured so as to be attached upon a lower portion of the steering support member; and a steering column configured so as to extend in approximately a forward and backward direction of the vehicle, and so as to be positioned upon a lower portion of the steering support member; the steering support member including an approximately triangular cross-section surface, characterized in that: the steering support member is attached at two front and back locations, in a suspension support state, respectively, to front and back fastening points (25, 26) that are configured so as to be provided respectively upon the front and back column brackets (22, 23); and the approximately triangular cross-section surface is configured to be formed by including a horizontal upper surface portion upon an upper surface thereof, which is configured so as to be approximately parallel with both the front and back direction and a width direction of the vehicle, a front incline surface portion upon a lower portion of the horizontal upper surface portion thereof, whereupon the front column bracket is attached, and a rear incline surface portion upon the lower portion of the horizontal upper surface portion thereof, whereupon the back column bracket is attached. a steering support member configured so as to extend in approximately a direction of a width of a vehicle, so as to be capable of connecting right and left panels of the vehicle, and so as to be positioned within an instrument panel; front and back column brackets (22, 23) configured so as to be attached upon a lower portion of the steering support member; and a steering column configured so as to extend in approximately a forward and backward direction of the vehicle, and so as to be positioned upon a lower portion of the steering support member; the steering support member including an approximately triangular cross-section surface, characterized in that: the steering support member is attached at two front and back locations, in a suspension support state, respectively, to front and back fastening points (25, 26) that are configured so as to be provided respectively upon the front and back column brackets (22, 23); and the approximately triangular cross-section surface is configured to be formed by including a horizontal upper surface portion upon an upper surface thereof, which is configured so as to be approximately parallel with both the front and back direction and a width direction of the vehicle, a front incline surface portion upon a lower portion of the horizontal upper surface portion thereof, whereupon the front column bracket is attached, and a rear incline surface portion upon the lower portion of the horizontal upper surface portion thereof, whereupon the back column bracket is attached. the steering support member is attached at two front and back locations, in a suspension support state, respectively, to front and back fastening points (25, 26) that are configured so as to be provided respectively upon the front and back column brackets (22, 23); and the approximately triangular cross-section surface is configured to be formed by including a horizontal upper surface portion upon an upper surface thereof, which is configured so as to be approximately parallel with both the front and back direction and a width direction of the vehicle, a front incline surface portion upon a lower portion of the horizontal upper surface portion thereof, whereupon the front column bracket is attached, and a rear incline surface portion upon the lower portion of the horizontal upper surface portion thereof, whereupon the back column bracket is attached.