| 摘要 |
Engaging pieces ( 35 ) for receiving a load are provided in sections of a rear frame ( 26 ) corresponding to both ends of a seat ( 9 ) in a width direction of a vehicle so as to project upward. Movably supported plates ( 61 ), which are movably supported by the engaging pieces ( 35 ), are formed at both ends of a bottom plate ( 51 ) of the seat ( 9 ) in the width direction of the vehicle, which are sections opposed to the engaging pieces ( 35 ). These movably supported plates 61 are positioned above the other sections of the bottom plate ( 51 ). Inner cushion materials ( 53, 54 ) harder than a cushion material ( 52 ) on a seat surface side are provided between these movably supported plates ( 61 ). The bottom plate ( 51 ) of the seat ( 9 ) is movably supported by the projecting pieces ( 35 ) at both the ends thereof and is never displaced in a height direction. When a weight of a rider is applied to the seat ( 9 ) as an impact load, a section between both the ends is elastically deformed to curve downward viewed from a front-rear direction of the vehicle, and an amount of downward deformation of the bottom plate ( 51 ) can be reduced. When the rider is seated, the rider sits on the inner cushion materials ( 53, 54 ) via the cushion material ( 52 ) on a seat surface side, and an impact, which cannot be eased by the cushion material ( 52 ) on the seat surface side, is eased by the inner cushion materials ( 53, 54 ).
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