Seat apparatus for vehicle

A seat apparatus for a vehicle, comprising:

• a vehicle information acquisition means for acquiring information on a lateral acceleration applied to the vehicle and a steering angular velocity;
• a calculation means for calculating a lateral acceleration for control used to calculate a control quantity for operating a side supporting portion by multiplying the lateral acceleration by a weighting coefficient when the steering angular velocity acquired by the vehicle information acquisition means is equal to or greater than a threshold value;
• an output means for outputting the lateral acceleration for control;
• and
• a control means for calculating the control quantity for operating the side supporting portion according to the lateral acceleration for control outputted from the output means and actuating the side supporting portion to be movable between a closed position and an open position in response to a support request based on the control quantity.