In a bed 11 including a wheelchair 9 and a bed main body portion 10, the wheelchair has a seating bottom portion 12 composed of bendably coupling a plurality of divided members, a chair bottom support member 13 supporting the seating bottom portion, the chair bottom support member for changing a shape of a leg bottom part in conjunction with inclination of a back bottom part, a chair base portion 14 fixing the chair bottom support member, front casters 15 provided in the chair base portion, the front casters being capable or freely changing the direction, both side wheel bottom support members 19 axially supported on the chair base portion, rear casters 16 provided in one ends of the both side wheel bottom support members, the rear casters being capable of freely changing the direction, traveling wheels provided in the other ends of the both side wheel bottom support members, whose traveling direction is fixed to the straight-moving direction, and caster links coupling 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.
