To provide a new raising and lowering device for smoothly and stably performing raising and lowering without generating play in the raising and lowering device of a bed and a care bed for moving a knee raising frame upwards and then vertically moving a back raising frame by the extension and contraction of a cylinder rod.

In the raising and lowering device of the bed and the care bed 1 for moving the knee raising frame 5 upwards and then vertically moving the back raising frame 3 by a linking rod 13 for operating the back raising frame 3 and the knee raising frame 5 by the extension and contraction of the cylinder rod at the center lower part, the linking rod 13 is provided with a cylindrical body 18 or a cylindrical body with an end and is tightly inserted to the cylinder rod, the cylinder rod and the linking rod are integrally connected and fixed by the traverse insertion of two pins 20, and the back raising frame and the knee raising frame are smoothly and stably elevated and brought down at all times without generating the play.