Vehicle seat

1. A vehicle seat comprising:

a seat cushion frame that forms a frame of a seat cushion to support buttocks and thighs of a seated occupant;

a center section spring that spans along a seat front-rear direction of the seat cushion frame at a center section in a seat width direction, the center section spring having a first extension portion that slopes downward from a rear of the seat cushion frame and a second extension portion that slopes downward from a front of the seat cushion frame;

two end section springs, disposed at a same position in a seat up-down direction as the center section spring in a seat side view, that span along the seat front-rear direction of the seat cushion frame at two end sections in the seat width direction, each end section spring having a first extension portion that slopes downward from a rear of the seat cushion frame and a second extension portion that slopes downward from a front of the seat cushion frame; and

a pair of connecting members that are formed of a rod shaped material, each of the connecting members disposed at a seat front side and a seat rear side, respectively, each of the connecting members being configured to: (1) be aligned with hip points of the seated occupant, and (2) link the center section spring to the two end section springs in the seat width direction,

wherein the two end section springs are set with a higher spring constant than the center section spring,

the first and second extension portions of the center section spring and the two end section springs extend in the seat width direction at a position where the pair of the connecting members are disposed, and

the pair of the connecting members are disposed to overlap with and are joined to a lower end side of the first and second extension portions of the center section spring and the two end section springs.

2. The vehicle seat of claim 1 , wherein the first and second extension portions of the two end section springs are formed of wires having a larger wire diameter than the first and second extension portions of the center section spring.

3. A vehicle seat comprising:

a seat cushion frame that forms a frame of a seat cushion to support buttocks and thighs of a seated occupant;

a center section spring that spans along a seat front-rear direction of the seat cushion frame at a center section in a seat width direction, the center section spring having a first extension portion that slopes downward from a rear of the seat cushion frame and a second extension portion that slopes downward from a front of the seat cushion frame; and

two end section springs, disposed at a same position in a seat up-down direction as the center section spring in a seat side view, that span along the seat front-rear direction of the seat cushion frame at two end sections in the seat width direction, each end section spring having a first extension portion that slopes downward from a rear of the seat cushion frame and a second extension portion that slopes downward from a front of the seat cushion frame,

wherein the two end section springs are set with a higher spring constant than the center section spring, and

the first and second extension portions of the two end section springs are formed of wires having a larger wire diameter than the first and second extension portions of the center section spring.

4. The vehicle seat of claim 3 , further including a connecting member that links the center section spring and the two end section springs in the seat width direction.

5. The vehicle seat of claim 4 , wherein a pair of the connecting members are respectively disposed at a seat front side and a seat rear side of hip points of the seated occupant.