In order to provide a wheelchair (1) capable of ensuring the safety of an occupant by securely restraining the occupant's body even in the event of collision of an automobile when the wheelchair (1) is put in the automobile, a wheelchair (1) has a seat body or seat (2) in which an occupant is seated, seat belts (7 through 11) capable of restraining the occupant's body, and seat belt retractors (12 through 16) which apply tension to the respective seat belts (7 through 11) in the winding-up direction and are provided with locking mechanisms for locking the movement of the respective seat belts(7 through 11) in the withdrawing direction when tension exceeding a predetermined value is applied to the seat belts (7 through 11). The seat body (2) has a monocoque structure in which a seating portion (17) on which the occupant is seated, a backrest portion (18) which receives the upper body of the occupant, a headrest portion (19) which is positioned on the upper end of the backrest portion (18) and receives the head of the occupant, mounting portions which are located on the lower surface of the seating portion (17) and to which main wheel shaft supporting portions (21) supporting a main wheel shaft (20) are mounted are formed integrally.