Abstract: This SiC heater includes a heating element having a thin plate-shaped silicon carbide sintered body and an insulating coat film formed on a surface of the silicon carbide sintered body, a pair of electrodes for conducting electricity in the heating element, and a heater base that holds the heating element from one surface side while insulating the heating element from heat from the heating element, the insulating coat film is located on a surface of the silicon carbide sintered body opposite to the heater base, an electrical resistivity at room temperature of the insulating coat film is 109 ?·cm or more, a thermal expansion coefficient of the insulating coat film is 2×10?6/K or more and 6×10?6/K or less, SiO2 is included as a matrix, 1% by weight or more and 35% by weight or less of a first additive component including at least one of B2O3 and Al2O3 is contained, and 1% by weight or more and 35% by weight or less of a second additive component including at least one of MgO and CaO is contained.

Abstract: This SiC heater includes a heating element having a thin plate-shaped silicon carbide sintered body and an insulating coat film formed on a surface of the silicon carbide sintered body, a pair of electrodes for conducting electricity in the heating element, and a heater base that holds the heating element from one surface side while insulating the heating element from heat from the heating element, the insulating coat film is located on a surface of the silicon carbide sintered body opposite to the heater base, an electrical resistivity at room temperature of the insulating coat film is 109 ?·cm or more, a thermal expansion coefficient of the insulating coat film is 2×10?6/K or more and 6×10?6/K or less, SiO2 is included as a matrix, 1% by weight or more and 35% by weight or less of a first additive component including at least one of B2O3 and Al2O3 is contained, and 1% by weight or more and 35% by weight or less of a second additive component including at least one of MgO and CaO is contained.