PROBLEM TO BE SOLVED: To allow the track of a thigh receptacle opening or closing to follow the motion of a coxa by mounting the thigh receptacle on a seat part so as to open askew upward with respect to the seat part and a knee receptacle on the thigh receptacle so as to move further upward with respect to the thigh receptacle. ;SOLUTION: A sheet 1 employs a bucket sheet and a rotating shaft 4 of a thigh receptacle 2 is arranged spaced from a seat part 5 almost to match the position of a coxa of a patient. The angle of inclination from a back rest part 6 of the sheet 1 to the seat part 5 is set, for example, at about 120° so that the patient will not feel unease in the inclination of the sheet 1 while the patient can take a relaxed attitude in sitting and the patient sits on the seat part 5 kept horizontal. The thigh receptacle 2 has a shape of the cross section thereof continued to the sheet 1 and right and left thigh receptacles 2 are put closely in the closed state to form a face as extension of the seat part 5. The thigh receptacles 2 are linked to a rotary arm 7 extended from the rotating shaft 4 arranged inclined to the bottom surface of the seat part 5 and both the thigh receptacles 2 are separated away from each other while being opened toward the sheet 1.;COPYRIGHT: (C)1997,JPO
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