Patent ID: 8287047

Claim:
A vehicle seat comprising: a plurality of spring members and a seat cushion supporting a human body by operation of the spring members, one of the plurality of spring members functioning dominantly by exhibiting greater reaction force than the other of the plurality of spring members, the vehicle seat having a structure such that when a first human body support portion having a center at a position substantially corresponding to a center between the pair of ischial tuberosities of a human body in the seat cushion, and a second human body support portion having a center at a position located forward at a horizontal distance of 100 millimeters along a longitudinal center line of the seat cushion from the first human body support portion are regarded respectively as spring elements made by operation of the plurality of spring members, a dynamic spring constant kd 1 of the first human body support portion and a dynamic spring constant kd 2 of the second human body support portion have a relationship of kd 1 <kd 2 and are set so that the second human body support portion becomes a fulcrum of motion during vibration damping operation, wherein the dynamic spring constants kd 1 , kd 2 are determined such that the one of said plurality of spring members which functions dominantly changes according to an excitation value of the input vibration.