The present invention as well as to be able to attach easily without damaging the existing roof, to improve the sealing property. A snow melting plate heater H, the electric heater 5 via an adhesive formed by sandwiched between a pair of metal plates 6,7, the inclination direction upper end 9b of the metal plates 6 and 7 of the roof R to form the upper insertion portion 12 which is inserted into a gap 3 of any one of goby section 4, located in the lower than the slope direction the lower edge 9a any one of the goby portion 4 of the metal plates 6 and 7 goby part It was constructed by forming a lower plug portion 13 to be inserted into a four gaps 3. Then, in the roof R, after it has been insert fixed to the insert portion 12 and 13 of the snow melting panel heater H in goby section 4, a caulking agent 14 from the outside between the insertion portions 12 and 13 and the roofing sheet material 2 in contact wear. .BACKGROUND 2
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