| 摘要 |
A lumbar support device for a vehicle seat is comprised a seat back frame comprising the side frames and an upper frame connecting an upper portion of each side frame, a spring member, and a support body supporting a part of the spring member so as to be movable in front and back directions relative to the seat back by a drive device. The lumbar support device also includes a retracting restriction mechanism disposed between the support body and the drive device or between the support body and the spring member to prevent the spring member from moving backward relative to the seat back when a load applied to the spring member is equal to or more than a predetermined value.
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