To provide a snow melting heater for a roof valley capable of efficiently saving melting snow at the roof valley and preventing the formation of icicles at low cost.SOLUTION: The snow melting heater 100 for a roof valley portion is composed of a belt-like heat generating portion 102 and a substantially triangular heat generating portion 104 connected to one end portion of the strip heat generating portion 102. The snow melting heater 100 for a roof valley part includes a substrate 110, an inner exterior sheet 120 adhered to the substrate 110, a heat generating sheet 130 bonded to the inner exterior sheet and having a pair of electrode wires 130 d arranged in the longitudinal direction, And an outer sheathing sheet 140 adhered to the sheet. The heat generating sheet 130 is composed of a resin film coated with a conductive particle material and an insulating layer covering the resin film. Instead of the heat generating sheet 130, a heat conductive sheet 134 and a pair of electrode wires 136 a, 136 b electrically connected to the heat generating sheet 130 installed on the peripheral edge of the heat conductive sheet And a heating wire 138 disposed between the pair of electrode wires.(FIG.
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