A bed is provided, including a support stand, a cover, a cover support, and an adjustment mechanism. The cover support is connected at a top of the support stand, and the cover is connected on the cover support to form a bed surface. The adjustment mechanism is configured to adjust a tense degree of the bed surface. Optionally, the bed can be further provided with a retaining mechanism to prevent the movement of the mechanism. The arrangement of an adjustment mechanism allows the tense degree of a bed surface of the bed during use to be adjusted as needed and meanwhile makes it possible to facilitate product transport and simplify product installation.

A folding support and a folding bed are provided. The folding support includes a supporting crossbar and a folding assembly arranged at each of two ends of the supporting crossbar. The folding assembly includes a connecting base, an upper supporting rod, and a lower supporting rod. The connecting base is fixedly mounted at an end portion of the supporting crossbar. The upper supporting rod is rotatably connected to the connecting base. The lower supporting rod is rotatably connected to the upper supporting rod. The upper supporting rod and the lower supporting rod are configured to rotate in an identical plane to implement folding and unfolding of the folding assembly. When the folding assembly is folded, the upper supporting rod and the lower supporting rod are folded toward each other, and the upper supporting rod and the lower supporting rod are positioned adjacent to a side of the supporting crossbar.