The rear frame includes an inclined part that is inclined inward in, a vehicle width direction in going rearward and a horizontal part that extends rearward from a rear end of the inclined part. A rear part of the side sill includes a first enlarged width portion that increases in width inwardly in the vehicle width direction via a bent portion. A front part of the rear frame inclined part includes a second enlarged width portion that increases in width outwardly in the vehicle width direction. A rear end of the first enlarged width portion and a front end of the second enlarged width portion are connected. An inner wall in the vehicle width direction of the first enlarged width portion and an inner wall in the vehicle width direction of the inclined part are linearly continuous in plan view.

A vehicle substructure is capable of efficiently transmitting a load inputted from a front subframe or a front suspension mechanism. The vehicle substructure includes a battery case having a battery housed therein, wherein the battery case includes a bottomed case pan having an opening at a top thereof, and a case cover to close the opening of the case pan, wherein the battery caser is partly formed of a cast member which is arranged at a front end of the case cover and coupled to a rear end of the front subframe.

A vehicle substructure prevents a side sill, when a load is inputted, from being turned. The vehicle substructure includes a battery case having a battery housed therein. The battery case includes a bottomed case pan having an opening at a top thereof, and a case cover to close the opening of the case pan. The case cover vertically has a top plate at a top, a bottom plate at a bottom, and partitions disposed between the top and bottom plates to couple the top plate with the bottom plate and linearly extending in a vehicle width direction so as to be substantially in parallel to each other. Both ends in the vehicle width direction of the case cover are connected to a pair of right and left side sills disposed on both the right and left sides in the vehicle width direction and extending in a vehicle front-rear direction.

A knee-airbag-device attachment structure comprises knee-airbag devices and vehicle-body side brackets which connect the knee-airbag devices and hinge pillars of a vehicle body, respectively. This knee-airbag-device attachment structure further comprises an instrument-panel-member supporting-post side bracket which connects the knee-airbag device to an instrument-panel-member supporting post which is provided to extend between an instrument panel member and a tunnel portion of a floor panel.

A lower vehicle-body structure comprises a vehicle floor comprising a bottom face portion and a floor tunnel which protrudes upwardly and extends in a vehicle longitudinal direction, a pair of right-and-left floor cross members extending in a vehicle width direction on both sides of the floor tunnel, and a connecting member provided to extend in the vehicle width direction at a position which overlaps the floor cross members in the vehicle longitudinal direction and be fixed to at least one of the vehicle floor and the floor cross members at plural fixation positions. These plural fixation positions are located at plural different levels in a range of a height of the floor cross members.

A lower vehicle-body structure comprises a vehicle floor comprising a bottom face portion and a floor tunnel, a pair of right-and-left first floor cross members extending in a vehicle width direction and provided on both sides of the floor tunnel, a pair of right-and-left second floor cross members extending in the vehicle width direction and provided on both sides of the floor tunnel, the second floor cross members being spaced rearwardly from the first floor cross members, a first connecting member provided to extend in the vehicle width direction at a position overlapping the first floor cross members in the vehicle longitudinal direction, and a second connecting member provided to extend in the vehicle width direction at a position overlapping the second floor cross members in the vehicle longitudinal direction.

A vehicle body structure is provided, which includes rear wheel houses covering left and right rear wheels, left and right rear damper supports supporting upper ends of rear suspension dampers provided to the rear wheel houses, left and right rear side panels, a floor cross member coupling the rear wheel houses in a vehicle width direction, forward and downward of the rear damper supports, a rear header, left and right lower reinforcements coupled at lower ends thereof to the floor cross member and at upper ends to a region adjacent the rear damper supports, and left and right upper reinforcements coupled at lower ends thereof to upper ends of the lower reinforcements and at upper ends to the rear header. A substantially annular shape is formed in a front view by the floor cross member, the rear header, and the left and right lower upper reinforcements.

A suspension member is mounted on the side members of an underbody. On the rear portion of the suspension member, spacers are provided between the suspension member and the underbody. Each spacer includes a bracket. The front end surface of the bracket is opposed to the rear wall surface of a main suspension body. During a frontal collision, the rear wall surface of the suspension member abuts against the bracket, whereby retreat of the suspension member is reduced.

A chassis platform module for an electric vehicle may include: a frame part having a battery mounted thereon; a first support part extended from one side of the frame part in a longitudinal direction, and having a front wheel chassis module mounted thereon; and a second support part extended from the other side of the frame part in the longitudinal direction, and having a rear wheel chassis module mounted thereon.

On a side face of a floor tunnel, a side reinforcement is disposed between an upper edge of the side face and a connected region at which a dash cross member is connected to the floor tunnel. An upper reinforcement extends in a longitudinal direction at an upper portion of the floor tunnel. The side reinforcement extends rearward with its rear edge inclining upward. A collision load input from a side member enters the side face of the floor tunnel via the dash cross member. The collision load is, then, transmitted to the upper reinforcement through the floor tunnel along the rear edge of the side reinforcement.