Vehicle seat

1. A vehicle seat comprising:

a pair of side frames disposed separately from each other in a lateral direction;

a pair of connecting frames disposed separately from each other to connect the pair of side frames;

a supporting member comprising a plate-shaped main portion, and hook portions hooked on the pair of connecting frames,

the supporting member being laid to bridge the pair of connecting frames, and configured to support an occupant,

the plate-shaped main portion comprising a bottom plate, and a wall raised from the bottom plate toward the hook portions; and

a position restricting member configured to contact the supporting member to thereby restrict a position of the supporting member in the lateral direction,

wherein the position restricting member is located on a laterally outer side of the wall.

2. The vehicle seat according to claim 1 , wherein the pair of side frames comprises a flange extending in a laterally inward direction,

wherein the position restricting member is configured to contact the supporting member in a position laterally inward of the flange.

3. The vehicle seat according to claim 1 , further comprising a link of a height adjustment mechanism, the link being rotatably connected to a corresponding one of the pair of side frames,

wherein the position restricting member is located adjacent to the link.

4. The vehicle seat according to claim 3 , wherein the position restricting member is configured to contact the link when restricting the position of the supporting member.

5. The vehicle seat according to claim 1 , wherein the position restricting member has an upper end located above the plate-shaped main portion.

6. The vehicle seat according to claim 1 ,

wherein the position restricting member is a tubular bracket via which the connecting frame is connected to a corresponding one of the side frames, the bracket being fitted on the connecting frame, and

wherein the bracket has a laterally inner end contactable with a laterally outer end of the hook portion.

7. The vehicle seat according to claim 1 , wherein the position restricting member is a tubular member in which the connecting frame is disposed and which is provided in a position between the hook portions and the pair side frames and configured to contact the hook portion.

8. The vehicle seat according to claim 7 , wherein the tubular member is not fixed to the connecting frame.

9. The vehicle seat according to claim 7 , wherein the tubular member is rotatably supported by the connecting frame.

10. The vehicle seat according to claim 7 , wherein the tubular member is fixed to the connecting frame.

11. The vehicle seat according to claim 7 , wherein the supporting member comprises a metal wire and a plastic member with which at least part of the metal wire is covered, and

wherein a portion of the hook portion which is configured to contact the tubular member is comprised of the plastic member.

12. The vehicle seat according to claim 7 , wherein the tubular member is made of plastic.

13. The vehicle seat according to claim 7 , wherein the tubular portion is not fixed to the connecting frame.

14. The vehicle seat according to claim 13 , wherein the tubular portion has a laterally inner end contactable with a laterally outer end of the hook portion, and a laterally outer end contactable with the side frame.

15. The vehicle seat according to claim 13 , further comprising a link of a height adjustment mechanism, the link being rotatably connected to a corresponding one of the side frames,

wherein the tubular portion has a laterally inner end contactable with a laterally outer end of the hook portion, and a laterally outer end contactable with the link.