To provide a charcoal manufacturing oven equipped with a boiler function, which can produce/supply steam using as a heating source the heat generated in the process of manufacturing charcoal that is a biomass, or the like; to provide a boiler for the charcoal manufacturing oven; and to provide a power generation system operated by the produced steam.

To the charcoal manufacturing oven (1), the boiler function is installed which can produce/supply steam using as the heating source (H) the heat generated in the process of manufacturing charcoal, or the like. Of the boiler function, a heat receiving portion (5) of the boiler water, which serves for the boiler water to receive the heat from the heating source (H), is installed inside the charcoal manufacturing oven (1) to result in the boiler function-added charcoal manufacturing oven (10).