Multi-functional bed

In a multifunctional bed in which a variable bed that can be changed into a wheelchair form is fitted in a U-shaped fixed bed, when a seat back portion of the variable bed is laid or raised, the variable bed may assume an unstable position, thus hindering a smooth form change. The present invention provides a multifunctional bed comprising a variable bed 3 that can be changed into a wheelchair form and a fixed bed 2 in which the variable bed 3 can be removably fitted, wherein a holding member is provided between the fixed bed 2 and the variable bed 3, for holding a vertical position of the variable bed 3 relative to the fixed bed 2, and the holding member comprises a vertical pair of guide rails 141, 143 disposed on a left and right inner side surfaces of a notched recess portion 20a of the fixed bed 2 formed so as to appear substantially U-shaped, and guide rollers 131, 133 disposed on both sides of a seat back portion 34 of the variable bed 3 Fig. 1B).