| 摘要 |
PROBLEM TO BE SOLVED: To provide a seat with an adjuster capable of changing the shape of a backrest into a given one simply upon seating and returning the shape of the backrest into an old one simply upon unseating. SOLUTION: The seat is provided with an adjusting mechanism for adjusting the shape of the backrest of the seat having a cushion and the backrest. The adjusting mechanism has a backrest shape adjuster incorporated into the backrest for expansion and contraction in order to change a back pad constituting the backrest and a first switch for changing the backrest shape adjuster for expansion or contraction, that is, for changing the backrest shape adjuster for expansion when a load is applied to the cushion during seating and for changing the backrest shape adjuster for contraction when the load is not applied to the cushion.
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