To provide a bed which is improved in reliability through the securing of an accurate operation and enables the changeover of functions corresponding to purposes and uses.

A bed body 1 is provided with a head part side bed body frame 1A and a leg part side bed body frame 1B, a back bottom 2 is attached to the head part side bed body frame 1A and a leg bottom 3 is attached to the leg part side bed body frame 1B, respectively operably, and both bottoms 2 and 3 are connected linkably through a linking mechanism 6. In a part of the linking mechanism 6, a switching mechanism 7 for selectively cancelling the linked state of both bottoms 2 and 3 is provided.