| 摘要 |
A seat back structure reduces shocks from the rear, is simple and light, and has lower production costs. The center headrest stay inserting portions are on each proximate upper portion of each seat back of a half-half divisional type seat, respectively, and headrest stays extend from a center headrest downward are removably inserted in the headrest stay inserting portions, respectively, and the seat backs are connected and restrained by the headrest stays.
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