In a bed including a wheelchair and a bed main body portion, the wheelchair has a seating bottom portion composed of bendably coupling a plurality of divided members. A chair bottom support member supports the seating bottom portion, the chair bottom support member changing a shape of a leg bottom part in conjunction with inclination of a back bottom part. A chair base portion fixes the chair bottom support member. Front casters are provided in the chair base portion, the front casters being capable of freely changing direction. Both side wheel bottom support members are axially supported on the chair base portion. Rear casters are provided at one end of the both side wheel bottom support members, the rear casters being capable of freely changing direction. Traveling wheels are provided at the other end of both side wheel bottom support members, whose traveling direction is fixed to a straight-moving direction. Caster links couple parts of the both side wheel bottom support members on the side of the rear casters and the back bottom part of the chair bottom support member.
