VEHICLE SEAT APPARATUS

An object of the invention is to provide a vehicle seat apparatus capable of facilitating posture retention of an occupant during turning. A vehicle seat apparatus 1 includes a seat unit supporting mechanism 9 rotatably supporting a seat unit 7 about a rotation axis A in a roll direction of a vehicle and a yaw direction of the vehicle. The rotation axis A is set so that a rear side is higher than a front side in a longitudinal direction of the vehicle seat apparatus 1, and so as to pass near a waist of a driver sitting on the vehicle seat apparatus 1. Then, the driver, during a steering operation, can adopt a posture where an inner side of hips in a turning direction is moved relatively upward in a vertical direction of the driver with respect to an outer side in the turning direction of the hips. In addition, the driver can adopt a posture where the inner side of hips in the turning direction is moved relatively forward in the longitudinal direction of the driver with respect to the outer side in the turning direction of the hips. This motion is an optimum motion when viewed from the law of conservation of angular momentum between the hips and the shoulders. Therefore, the driver can comfortably perform a steering operation, thereby improving steering operability of an occupant.