Patent ID: 7992927

Claim:
A reinforcing brace which is installed to an undersurface of a floor panel of a vehicle so as to extend in a vehicle width direction for reinforcing the floor panel, the reinforcing brace comprising a longitudinal press-formed product which is obtained by press bending each end portion of a steel plate in a width direction thereof to one side in a thickness direction of the steel plate, the longitudinal press-formed product including: a cylindrical section located at a middle area in a longitudinal direction thereof, a maximum width of the cylindrical section in a front to back direction of the vehicle being larger than a maximum width thereof in a vertical direction of the vehicle in a state where the reinforcing brace is installed to the floor panel, and the cylindrical section having a cross sectional shape which is taken along a plane perpendicular to an axis thereof in which a width of the cylindrical section in the vertical direction gradually decreases from a middle area thereof toward each end side thereof, so that an outer surface of the cylindrical section functions as a regulating surface which reduce air resistance by regulating a flow of air passing under the floor panel while driving; and flat portions located at both end side portions in the longitudinal direction thereof, which have not been subjected to a press bending, each of the flat portions having a plurality of insertion holes for fastener members which is used to install the flat portions to the floor panel.