Heating device and engine drive method

A heating device is capable of efficiently heat a heated body as heating object. The heating device includes a heating body (1), a power source (5) for supplying a current to the heating body (1), a current control element (4) controlling current flowing through the heating body (1), and a heat conductive body (2) to be thermally coupled with the heating body (1) and the current control element (4) for transmitting heat generated by the heating body (1) and heat generated by the current control element (4) to a heating object.