To keep a stable sleeping posture and to promise a good sleep without generating stiff neck, stiff shoulders, lumbagos, a bedsore, etc., by making degree of cushion freely adjustable in cope with individual taste.

A bed main body 5, two pipes arranged at established intervals and in parallel at a position separated from the floor face on both side of the bed main body 5, a handle 7 with a ratchet for preventing the direction of rotation from being reversed for rotating one pipe 6A of the two pipes around the shaft and a net 9 spread between two pipes are provided and the net 9 is wound on one pipe 6A by rotating the handle 7 and tension of the net 9 can be adjusted thereby.