To fold and unfold a bed easily and safely, basically by attaching a handle, which can be held by hand, to a pivotally connecting part for connecting first and second mounting frames.

The folding bed comprises a first bed frame body with a support leg part attached to the first mounting frame on which a half body of a mat is mounted, and a second bed frame body with a support leg part attached to the second mounting frame on which the other half body of the mat is mounted. The handle is attached to the pivotally connecting part to connect facing ends of the first mounting frame and the second mounting frame in such a way that the bed can be folded in an inverted V-shaped vertical state and unfolded in a deployed state with the first and second mounting frames being horizontally deployed.