Patent ID: 8226165

Claim:
A vehicle seat comprising: a back frame ( 3 ) for a seat back ( 2 ); a single synthetic resin cushion plate ( 31 ) being capable of supporting the back of a seated passenger and attached to the back frame ( 3 ) by way of seat springs ( 32 ) so as to be movable forward or backward relative to the back frame ( 3 ); a single elastic auxiliary plate ( 40 ) attached to the cushion plate ( 31 ) so as to be movable forward or backward relative to the cushion plate ( 31 ); a specific section of the auxiliary plate ( 40 ) formed as a push-out section ( 70 ) protruding forward when a distance between an upper edge and a lower edge of the auxiliary plate ( 40 ) is shortened by moving the lower edge upward, the push-out section ( 70 ) being positioned only below a center line of the auxiliary plate ( 40 ) so as to support lumbar vertebrae of a person seated in the vehicle seat; wherein elasticity of the auxiliary plate ( 40 ) supporting the body of the seated passenger is adjusted by moving the auxiliary plate ( 40 ) near the push-out section ( 70 ) forward or backward; and wherein the push-out section ( 70 ) has a corrugated part formed from a sideways projection that projects forward or/and backward as viewed from a side, said corrugated part being in a maximum forward projection position.