Patent ID: 7823964

Claim:
A bottom structure of a vehicle body, comprising: a vehicle body floor that constitutes an undersurface of a vehicle compartment floor; a plurality of vehicle frame members provided below the vehicle body floor and extending along a longitudinal direction of a vehicle, the plurality of vehicle frame members including: a pair of outer frame members arranged outside of a pair of inner frame members in a lateral direction of the vehicle, the pair of inner frame members bending outwardly toward the outer frame members in a forward direction of the vehicle; a pair of cross members extending in a lateral direction of the vehicle, each of the pair of cross members including: a bottom wall that curves upwardly substantially from a respective one of the outer frame members and towards the upper side of the vehicle in a cross-member middle portion and that is not in contact with an undersurface of the vehicle body floor panel; a pair of sidewalls that extend from edges of the bottom wall which run in the lateral direction of the vehicle, respectively; and a pair of flanges that extend from edges of the side walls which run in the lateral direction of the vehicle, respectively, the flanges being joined to the undersurface of the vehicle body floor panel, wherein: each of the pair of cross members is joined to a respective one of the pair of outer frame members and a respective one of the pair of inner frame members; and a closed cross-sectional area, which is closed as viewed from the front of the vehicle, is defined between each of the pair of cross members, the vehicle body floor panel, the pair of inner frame members, and the pair of outer frame members.