Abstract: 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.

Abstract: 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.

Abstract: To form a child seat having relatively wide regulated side walls in a relatively thin folding seat back for a wagon or light van, without changing the hip point of the rear seat passenger, the rear seat is divided into a first wide seat back and a second narrow seat back in such a way as to be folded up frontward separately, a recessed seat back portion of the child seat is formed at roughly a vehicle-middle portion of the first wide seat back, a child seat cushion of the child seat is pivotally mounted at the child seat recessed seat back of the first wide seat back, and in particular, two side wall portions of the child seat are formed by a first projecting portion of the first wide seat back along an inner stepped portion of the recessed seat back portion and by a second projecting portion the second narrow seat back along an inner end surface of the second narrow seat back, respectively, in such a way that the child seat cushion can be accommodated in the recessed seat back portion when not used.

Abstract: To form a child seat having relatively wide regulated side walls in a relatively thin folding seat back for a wagon or light van, without changing the hip point of the rear seat passenger, the rear seat is divided into a first wide seat back and a second narrow seat back in such a way as to be folded up frontward separately, a recessed seat back portion of the child seat is formed at roughly a vehicle-middle portion of the first wide seat back, a child seat cushion of the child seat is pivotally mounted at the child seat recessed seat back of the first wide seat back, and in particular, two side wall portions of the child seat are formed by a first projecting portion of the first wide seat back along an inner stepped portion of the recessed seat back portion and by a second projecting portion the second narrow seat back along an inner end surface of the second narrow seat back, respectively, in such a way that the child seat cushion can be accommodated in the recessed seat back portion when not used.