The objective of the present invention is to reduce the loss in functionality due to the burn-out of micro-coils in a heating device, which uses micro-coils formed of carbon or molecules that include carbon as a principal component for heating a target object located in a space where high-temperature gases flow. The present invention relates to a heating device comprising: a heat producing layer having a micro-coil formed of carbon or molecules that include carbon as a principal component, where the heat producing layer is installed together with the target object located in a target space where high-temperature gases flow; and an electromagnetic (EM)-wave-emitting device that emits EM radiation into the target space. The target object is heated by producing heat in the micro-coil by EM radiation from the EM wave emitting device emitted to the target space. The heating device further comprises a covering layer, which coats the entirety of the heat producing layer.