Vehicle seat

1. A vehicle seat, comprising:

a seat main body on which an occupant can be seated; and

a side support device configured to support a cushion side portion of the seat main body in a seat widthwise direction to be switchable between a seating available state where the occupant can be seated and a vehicle exit assist state where a vehicle exit behavior of the occupant is assisted, wherein the vehicle seat comprises:

a first detector configured to detect sitting of the occupant on the seat main body;

a second detector configured to detect a state change in a detection subject that changes state in accordance with the vehicle exit behavior of the occupant; and

an operation device configured to operate the side support device so that the cushion side portion is switched from the seating available state to the vehicle exit assist state when the second detector detects the state change in the detection subject after the first detector starts detecting the sitting of the occupant,

wherein:

the side support device comprises a lock device configured to lock the cushion side portion in the seating available state;

the operation device is a lock release device configured to release a lock state of the lock device;

the first detector is a first lock release lever;

the second detector is a second lock release lever;

the first detector and the second detector are respectively inclined relative to a horizontal surface when the cushion side portion is in the seating available state;

the second detector is inclined diagonally upward and outward in the seat widthwise direction when the cushion side portion is in the seating available state;

the first detector is inclined diagonally upward and inward in the seat widthwise direction when the cushion side portion is in the seating available state; and

the operation device is configured to operate the side support device to release the lock state of the lock device when an operation by the second lock release lever occurs after the first lock release lever starts an operation.

2. The vehicle seat according to claim 1 , wherein the operation device is configured to operate the side support device when the detection by the second detector occurs while the first detector continues to detect the sitting of the occupant.

3. The vehicle seat according to claim 1 , wherein:

the first detector is arranged in a center portion in the seat widthwise direction in the seat main body; and

the second detector is arranged in the cushion side portion in the seat main body.

4. The vehicle seat according to claim 3 , wherein the second detector detects sitting of the occupant on the cushion side portion as the vehicle exit behavior of the occupant.

5. The vehicle seat according to claim 4 , wherein an area of the first detector for receiving a sitting load imposed by the occupant is larger than an area of the second detector for receiving the sitting load imposed by the occupant.

6. The vehicle seat according to claim 1 , wherein:

the seat main body comprises a seat cushion that serves as a sitting portion;

the side support device is configured to support the cushion side portion of the seat cushion to be switchable; and

the first detector and the second detector are respectively arranged in a center portion in a seat front to back direction in the seat cushion.

7. The vehicle seat according to claim 1 , further comprising a child seat detector configured to detect an attachment of a child seat to the seat main body, wherein the operation device is configured to operate the side support device so that the cushion side portion cannot be switched when the detection by the child seat detector occurs.

8. The vehicle seat according to claim 1 , wherein:

an anchor member that attaches an attached portion provided for the child seat is provided in the seat main body; and

the first detector and the second detector are respectively arranged outside the anchor member in the seat widthwise direction in the seat main body.

9. The vehicle seat according to claim 1 , wherein:

the first detector is arranged below the second detector when the cushion side portion is in the seating available state; and

the first detector is arranged above the second detector when the cushion side portion is in the vehicle exit assist state.

10. The vehicle seat according to claim 1 , wherein:

the side support device rotationally moves so that the cushion side portion moves in a top to bottom direction.

11. The vehicle seat according to claim 1 , wherein:

the first detector and the second detector are configured to rotate respectively.

12. The vehicle seat according to claim 1 , wherein:

the cushion side portion comprises a cushion material; and

the second detector is arranged below the cushion material.

13. The vehicle seat according to claim 1 , wherein:

the side support device comprises a side plate that is configured to support the cushion side portion from below; and

one of the first detector and the second detector is arranged on the side plate.

14. The vehicle seat according to claim 1 , wherein:

the first detector is longer than the second detector in the seat widthwise direction and in a seat front to back direction.

15. The vehicle seat according to claim 1 , wherein:

the side support device comprises a side plate that is configured to support the cushion side portion from below;

a through hole passing through the side plate in a top to bottom direction is provided on a top surface of the side plate; and

the second detector is provided to pass through the through hole, and is longer than the through hole in a seat front to back direction.