Patent ID: 7100990

Claim:
A structure of a seat back in a vehicle seat, in which the seat back has a seat occupant's back support side facing in a forward direction of the vehicle seat to supportively receive a back of an occupant on the vehicle seat and a backward side facing in a backward direction of the vehicle seat, comprising: a back board provided in said backward side of said vehicle seat, said back board having a forward side facing to said forward side of said seat back and a backward side corresponding to said backward side of said seat back; said back board being so arranged as to normally provide a substantially flat plane rigid enough to withstand a first load applied toward said backward side of the back board, thereby to allow the back board to be usable as a means for carrying load and cargo thereon, while being resiliently deformable in said backward direction of the vehicle seat by a second load applied toward said seat occupant's back support side of said seat back, wherein said back board includes a plurality of crevices which are normally closed to retain said back board in a substantially flat state, and wherein said crevices open when the backboard is resiliently deformed in said backward direction by the second load applied to said back board in said backward direction of the vehicle seat.