PURPOSE: To manufacture an electric heat board which is good in durability and can by simply manufactured by thermally depositing a plate material, on whose surface and back thermally fusing sheets are furnished, onto the whole plane of a heat insulating material where a heater wire is furnished.

CONSTITUTION: An electric heat board is made up of a heating insulating material 1 of such synthetic resin as foamed styrol resin, a plate material 3 such as a steel plate, etc., to reinforce this heat insulating material 1 and a resin coating sheet 5 which covers them. In the heat insulating material 1, a groove 9 for fitting a heater wire 7 therein is formed, and in the groove 9, the heater wire 7 is furnished. On the surface and back of plate material 3, thermal deposit sheets 11 such as hot-melt sheets are furnished. The heat insulating material, the plate material and the resin coating sheet 11 are thus stuck to each other, so that the durability of the electric heat board can be improved and it can be manufactured with ease.