Vehicular seat device

The vehicular seat device according to claim 20, wherein the cooperation portion includes:

• a first linking member whose first end is pivotably linked to a vehicle floor member, and whose second end is pivotably linked to a seat cushion frame of the seat cushion;
• a second linking member whose first end is pivotably linked to a position on the seat cushion frame which is rearward, relative to the vehicle, of a linking position of the first linking member, and whose second end is pivotably linked to a seatback frame of the seatback;
• and
• a drive mechanism that causes the second linking member to be drivable rotationally about the second end of the second linking member and changes the posture of the seat cushion via the second linking member synchronously with the tilting of the seatback when the seat arrangement is changed between the seating state and the entry/exit state.

The vehicular seat device according to claim 20, wherein the cooperation portion includes:

• a first linking member whose first end is pivotably linked to a vehicle floor member;
• a second linking member whose first end is fixed to the seat cushion frame and whose second end is pivotably linked to a seatback frame of the seatback;
• a third linking member whose first end is pivotably linked to a second end of the first linking member, and whose second end is pivotably linked to the seatback frame, and which, together with the first linking member, supports the seat cushion when the seat arrangement is the seating state;
• and
• a drive mechanism that is constructed so as to be able to drive the second linking member rotationally about the second end of the second linking member synchronously with the tilting of the seatback, and that changes the posture of the seat cushion via the second linking member.

A vehicular seat device comprising:

• a seat cushion;
• a seatback which is provided on a base member via a reclining mechanism and whose inclination angle is adjustable;
• and
• a cooperation portion that changes a posture of the seat cushion synchronously with tilting of the seatback,
• wherein as seat arrangements, the vehicular seat device assumes an entry/exit state in which the seatback is tilted forward and the seat cushion is in a flipped position, a retracted state in which the seat cushion is moved forward downward relative to a vehicle and the seat cushion is superimposed on an upper side of the seatback, and a seating state in which the seatback is not tilted forward, and the seat cushion is not moved forward downward relative to the vehicle or the seat cushion is not in the flipped position, and the seat arrangement is changed via the cooperation portion.