The present invention relates to a patient bed that can easily move a serious patient or an elderly person lying in a fixed bed to a mobile bed or a wheelchair, a fixed bed with five mats divided by four gaps, and the fixed bed Vertical expansion means in which the tip rises and falls in the vertical direction when air at a constant pressure is introduced in accordance with an electric control signal transmitted from the control means while standing upright in the vertical direction of the fixed bed from the four corners of the fixed bed. It is made of a hollow cube shape, the first case is installed on the upper end of the two vertical expansion means installed on both sides of the front end of the fixed bed, the front end is made of a hollow cube shape with the tip open and the hollow inside, the bottom both sides fixed At the top of the two vertical extension means installed at the corners of the rear end of the bed A second slide, a first slide bar which is slid out of the first case or slides inward of the first case by an external power source while being fitted inwardly of the first case through the open tip of the first case, and And a second slide bar which is slid out of the second case or slides inward of the second case by an external power source while being fitted into the second case through the open end of the second case. In addition, the present invention is a first rack gear mounted in the longitudinal direction of the first slide bar on any one side of the first slide bar, and mounted on either side of the second slide bar in the longitudinal direction of the second slide bar. Second rack gear, the gear is fixed to the first case and the gear shaft meshing with the first rack gear is mounted on the motor shaft inserted into the first case so that the motor shaft is controlled by the electrical control signal transmitted from the control means. A first reverse rotation motor, which pushes the first slide bar out of the first case or pulls inward o
