To provide a heat generating device enabling complete combustion of fuel and flue gas in one combustion chamber.

The heat generating device includes a gasification furnace, a combustion furnace and an exhaust cylinder. The gasification furnace includes a storage part, a dry distillation part and a combustion part from the upper side to form a series of pipe lines. The storage part includes a sealing means for opening/closing an upper end opening, and the dry distillation part includes an air supply chamber surrounding the periphery. The combustion part is protruded from the lower end of the air supply chamber and communicated with the combustion furnace, and the lower end of the combustion chamber includes a fire grate supporting fuel filled in the combustion chamber. A partition wall partitioning the dry distillation part and the air supply chamber includes an air supply hole penetrated through the partition wall. The combustion furnace surrounds the dry distillation part and combustion part of the gasification furnace, and the exhaust cylinder is communicated with the combustion chamber of the combustion furnace.

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