PURPOSE: To prevent cold in a bed room by forming a frame from iron or the like which can be processed, and by covering the same with a heat-insulating material such as cloth, cotton, polyester cotton or the like.

CONSTITUTION: Right and left legs 4 made of suitable materials 3 which can be processed are provided and assembled by fastening them with screws or by welding them. A cover 10 made of a heat insulating materials such as cloth, cotton, polyester cotton or the like is set on a bed 11 and is tighten then with ropes 8. Thus obtained article is brought into a bed room, and is set on a bed or a laid quilt so as to cover the head or face of a person. Accordingly, it is possible to keep the person from cold due to variations in the atmospheric temperature, and thereby it is possible to obtain a comfortable sleep.