The wheelchair (20) comprises a first seat surface part (22) and a second armrest (24) rotatably fixed to a first support part (22 b) of the first seat surface part (22) The first rotation axis (27) of the armrest (24) is perpendicular to the back support surface (22 a) and on the imaginary plane (28) parallel to the front-back direction of the first seat surface portion (22), the back support surface (22a) so as to form a predetermined angle.
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