PURPOSE: To obtain a heating effect even in the place the hot air does not reach by coating a heatproof paint including a ceramics component on the surface other than the surface a positive property thermistor of a metallic radiator is fixed.

CONSTITUTION: On the surface other than the surface where a positive property thermistor 5 of a metallic radiator 6 is fixed, a heatproof paint 8 including a ceramics component is coated. As a result, when the air is passed to the current flowing part of the metallic radiator 6 by applying a voltage to the positive property thermistor 5, the positive property thermistor 5 generates heat and the heat is stabilized around the Curie temperature. The heat is transferred to the air through the current flowing part of the metallic radiator 6, and the room heating can be carried out. And the heatproof paint 8 including the ceramics component is also heated, and extreme infrared rays are emitted therefrom. Consequently, a heating effect is obtained even in the place the hot air does not reach.