To provide a high temperature heating furnace capable of lowering the watt density (W/cm2) of a heating plate, as a surface of the heating plate is enlarged, making the temperature of the heating plate close to the furnace temperature, and effectively inhibiting the wild motion of the heating plate.

In this heating furnace for high temperature, a strip-shaped heating element curved in the zigzag or wave shape is buried in an inner face of a furnace wall in a state that its face is directed to a core, or mounted in a groove formed on the inner face of the furnace wall, holding members are respectively fixed to a plurality of parts of the strip-shaped heating element at their one end, and the other ends of the holding members are extended into the furnace wall and fixed. A curving angle of the strip-shaped heating element is 90° or more.