Disclosed is difficult to deflection in a large ceiling plate, safely can be used and the assembly is improved, degradation during storage or reuse depending on the season, easy assembly, large set up strength to provide a safe-to-use table structure. The top plate 1 supported by the A leg 5, is formed by mounting the surface member 12 and back member 13 on the upper and lower surfaces of a plurality of corner timber 11 laid in parallel, a metal square pipe 14 of the pair outer shape to form a square timber 11 and the reinforcing timber 16 substantially equal to sandwich from the back and forth square timber material 11A, a plurality of reinforcing timber 16 and mix the square timber material 11. When mounting the heat source to the top plate lower surface, a reflective layer on the rear surface of the top plate 1 provided with a far-infrared heating layer on the lower surface of the reflective layer is disposed, it is blocked by the insulating portion and is electrically connected to one another forming a far-infrared heating layer by arranging a plurality of heating element plate, and was fitted with a far-infrared heating layer on the bottom surface of the top plate 1 through the peripheral and the insulating portion. .BACKGROUND
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