Patent ID: 8282154

Claim:
A vehicle body lateral side portion structure, comprising: a side sill inner that extends in a vehicle longitudinal direction, wherein an inner side wall of the side sill inner includes an inner side wall planar portion; and a side sill reinforcement that is laterally exterior to the side sill inner while extending in the vehicle longitudinal direction, the side sill reinforcement being joined to the side sill inner to define a side sill that has a closed cross-sectional structure, the side sill being arranged as a vehicle body frame component that extends along the vehicle longitudinal direction, wherein the side sill includes a distal end portion that is connected to a front side frame of the vehicle body and a rear end portion that is connected to a rear frame portion of the vehicle body, and wherein the side sill reinforcement includes an outer side wall having a plurality of step portions and a curved surface portion that is curved over an entire length in the vehicle longitudinal direction, the curved surface portion having an apex point in the vehicle longitudinal direction, the apex point being laterally spaced from the inner side wall planar portion a distance that is greater than any other point of the curved surface portion as the curved surface portion extends between a front end and a rear end of said side sill, the apex point being in a vicinity of a join position with a center pillar of the vehicle body.