Vehicle seat

A vehicle seat comprising:

• a fixed frame configured to be fixed to a vehicle;
• a seat cushion comprising a front end portion and a rear end portion, the seat cushion being configured to be displaced between (i) a relaxation position in which the front end portion is at a higher position than the rear end portion and (ii) a normal position in which a height difference between the front end portion and the rear end portion is smaller than that in the relaxation position;
• a first link comprising a first end portion and a second end portion, the first end portion being rotatably coupled to the front end portion of the seat cushion;
• a second link comprising a third end portion and a fourth end portion, the third end portion being rotatably coupled to the second end portion of the first link, and the fourth end portion being rotatably coupled to the fixed frame;
• a driving body rotatably coupled to the fixed frame and configured to rotate by receiving torque from an electric motor;
• and
• a coupling device configured (i) to couple the second link with the driving body for the relaxation position and (ii) to release the coupling between the second link and the driving body in response to an acceleration in a seat forward direction exceeding a predetermined magnitude.