To provide a carbonization oven capable of reducing the change of temperature in the carbonization oven to control the amount of air charged into the oven, thus improving a carbonization yield and shortening a carbonization time, and further capable of improving the ignition state of the oven into a sectorial flame diffusion state, thus reducing an ignition time and uniformly heating a carbonization material to prevent the natural fire extinction and perfect combustion of the carbonization material.

This carbonization oven 1 comprises heat-resistant wall members which have an opening 1A at the upper end and in which a lid plate 2 is openably disposed on the opening 1A. Carbonization baskets 5 for receiving a carbonization material to carbonize the material are disposed in the carbonization oven 1 in a state that the carbonization baskets can be put in or put out through the upper end opening 1A. An ignition burner 15 and its sectorial flame guide 16 are disposed on one end surface of the carbonization oven 1 so that the flame is sectorially and obliquely diffused along the lower surface of the lid plate 2 in the oven 1.