To maintain the side view curve shape of an elastic film-like member on a sitting surface over a long period of time and to keep a stable sitting posture.
From the rear part frame member 8B of a seat frame 8, a rear tongue piece 11 curved forward and downward so that its front end part 11a is positioned below the upper surface of the rear part frame member 8B is extended. The rear end edge 9b of the elastic film-like member 9 is supported at the front end part of the rear tongue piece. The elastic film-like member forms a gentle arc shape connecting the highest point P of the front part to the lowest point Q supported at the front end part which is curved downward of the rear tongue piece in the side view. Thus, a recessed part 12 to be gradually deep from the almost middle part of the back and forth direction on the sitting surface of a seat body 6 to the front end part of the rear tongue piece of the rear part frame member is formed.
SAOTOME HIROSHI
ISOGAI YOSHINORI
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Noritsugu Nakama
Hiroyuki Mori