A heating device in which uniform heating of an article to be processed is possible even in the case a temperature change which leads to a loss of the uniformity of the temperature distribution in a narrowly delineated area, and in which a reduction in the size of the device is possible. The heating device has a plurality of heaters, each heater having a single bulb of transparent material in which there is a filament that is divided in the axial direction into several filament parts and the respective filament parts are supplied with power independently of each other.