Lower structure of vehicle

1 . A lower structure of a vehicle, comprising:

an onboard member arranged below a floor panel of the vehicle;

a frame member arranged on an outward side, in a vehicle width direction, of the onboard member;

a protection member arranged below the frame member so as to face the onboard member from the outward side, in the vehicle width direction, thereof; and

a support member fixed to a lower face of the frame member so as to support the protection member,

wherein said support member comprises a bottom wall portion including a facing portion which faces an upper end portion of said protection member in a vertical direction and extending along the lower face of said frame member and a vertical wall portion having a base end thereof which corresponds to an inward edge, in the vehicle width direction, of said bottom wall portion and extending downward, and

said vertical wall portion is provided with a curve portion protruding inward, in the vehicle width direction, and an extension portion extending toward a tip side from said curve portion and positioned on the outward side, in the vehicle width direction, of the curve portion.

2 . The lower structure of the vehicle of claim 1 , wherein said support member comprises a first support member including said bottom wall portion and said vertical wall portion and a second support member made of a different member from said first support member and fixed to the lower face of said frame member, and said second support member comprises a second bottom wall portion extending along said bottom wall portion at a position which is located below the bottom wall portion or between the bottom wall portion and the frame member and including a second facing portion which faces said facing portion in the vertical direction.

3 . The lower structure of the vehicle of claim 2 , wherein said second support member comprises a second vertical wall portion extending downward from an inward edge, in the vehicle width direction, of said second bottom wall portion.

4 . The lower structure of the vehicle of claim 3 , wherein a lower end of said second vertical wall portion is positioned above said curve portion.

5 . The lower structure of the vehicle of claim 2 , wherein said first support member and said second support member are fastened to said frame member by a common fastening member, and the first and second support members are joined together at respective forward-and-rearward positions, in a vehicle longitudinal direction, of said fastening member.

6 . The lower structure of the vehicle of claim 5 , wherein said first support member and said second support member are fastened to said frame member by said fastening member at a forward position, in the vehicle longitudinal direction, of said facing portion, and the first and second support members are joined together at a rearward position, in the vehicle longitudinal direction, of a longitudinal center of the facing portion.

7 . The lower structure of the vehicle of claim 1 , wherein said extension portion extends downward from said curve portion.

8 . The lower structure of the vehicle of claim 2 , wherein said extension portion extends downward from said curve portion.

9 . The lower structure of the vehicle of claim 3 , wherein said extension portion extends downward from said curve portion.

10 . The lower structure of the vehicle of claim 4 , wherein said extension portion extends downward from said curve portion.

11 . The lower structure of the vehicle of claim 5 , wherein said extension portion extends downward from said curve portion.

12 . The lower structure of the vehicle of claim 6 , wherein said extension portion extends downward from said curve portion.