Abstract: In a vehicle side body structure, when a force that deforms a side door inward in a vehicle width direction acts on the side door, a second engagement section enters a clearance in the vehicle width direction of the side door, a first engagement section and the second engagement section respectively engage with a first engaged section and a second engaged section, and an engagement structure bent with the first engagement section serving as a fulcrum, so as to prevent the side door from flipping up.

Abstract: A lower vehicle-body structure of a vehicle is provided with a frame member having a closed-cross section. The frame member comprises a first portion and a second portion. The first portion comprises a compression face portion and a pair of side face portions. The side face portion comprises a bending portion, a compression-side area which is positioned on a side of the compression face portion relative to the bending portion and where a compressive stress is generated when the bending load is applied, and a tension-side area which is positioned on a side away from the compression face portion relative to the bending portion and where a tensile stress is generated when the bending load is applied. The compression-side area is configured to have higher rigidity than the tension-side area.

Abstract: A side sill constituting a vehicle body comprises a side sill outer and a side sill inner. Each of an upper-side side face portion (upper face portion) and a lower-side side face portion (lower face portion) of the side sill inner comprises a second bending portion (bending portion) being formed by each of the upper face portion and the lower face portion bent toward an inside of the side sill, an upper-side slant face portion and a lower-side slant portion which respectively extend toward the side sill outer in an oblique direction such that a width, in a vertical direction, of the side sill inner gradually increases, and a second upper face portion and a second lower face portion (vehicle-width-direction face portions) which respectively extend in a vehicle width direction toward an inward side, in the vehicle width direction, from the second bending portion.

Abstract: A side sill comprises a side sill outer and a side sill inner. Each of an upper-side side face portion (upper face portion) and a lower-side side face portion (lower face portion) of the side sill outer comprises a first bending portion bent toward an inside of the side sill. The side sill inner comprises an upper-side side face portion with a first upper face portion, an upper-side slant face portion and a second upper face portion and a lower-side side face portion with a first lower face portion, a lower-side slant face portion and a second lower face portion. The side sill inner comprises a pair of upper-and-lower second bending portions which are bent toward an inside of the side sill at respective positions between the second upper face portion and the upper-side slant face portion and between the second lower face portion and the lower-side slant face portion.