| 摘要 |
A shoulder receiving portion is defined in each of two lateral frame members of seat back framework of vehicle seat in order to receive two shoulder portions of seat occupant in the case of rear-end collision, prior to a seat occupant's back portion being moved close to an upper frame member of the seat back framework. The shoulder receiving portion is therefore arranged in an upper region of each of the two lateral frame members so as to project forwardly from a plane where the two lateral frame members lie, and the upper frame member is formed in substantially "inverted-U" shape and inclined backwardly distant from the two lateral frame members, This arrangement avoids unpleasant pressed touch to be given to the seat occupant's back portion in the case of rear-end collision and may prevent a great impact from being imparted to vertebrae of the seat occupant.
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