Patent ID: 8132857

Claim:
A vehicle seat comprising: a seat back frame having right and left side frames; a headrest mounted to the seat back frame; a rear-end collision detector mounted to the seat back frame, wherein the rear-end collision detector detects rearward movement of a seat occupant and moves rearward; and the rear-end collision detector acts such that the rearward movement of the rear-end collision detector decreases a distance between a head of the seat occupant and the headrest; a respective support shaft mounted to each side frame; a link member mounted to the support shaft; a bracket that supports the support shaft and has an upper fixing portion and a lower fixing portion, the bracket being fixed to the side frame by way of the upper fixing portion and the lower fixing portion; and a biasing member that biases the link member; wherein: a lower portion of the link member is connected to the rear-end collision detector; each of the side frames is provided with a front projecting wall inwardly projecting and integrally formed at a front end of the respective side frame, and a rear projecting wall inwardly projecting and integrally formed at a rear end of the respective side frame; each of the side frames comprises a lateral face, the lateral face comprising a concave portion that is indented or concave in a direction towards the other side frame; the support shaft is mounted at a same height as the concave portion; and at least one of the upper fixing portion and the lower fixing portion is fixed to a concave portion of the side frame at a position entirely behind a front projecting wall and in front of a rear projecting wall of the side frame.