| 摘要 |
A seat apparatus comprises a backrest portion which can be tilted, a hook mounted on the upper portion which is a tilting end, a sitting portion which can raise on a fulcrum, which is a front edge, and an engaged portion which can engage a book mounted on a rear. When the sitting portion is raised, the rear of the sitting portion is turned toward the backrest portion side. When the backrest portion is tilted forward, the hook is engaged with the engaged portion, the backrest portion and the sitting portion are fixed to each other, and then it is in a double folded state. The hook is arranged at a position where a tether strap for mounting an auxiliary seat on the backrest portion is hung. The hook is integrally formed with a guide of the tether strap.
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