To provide a screw conveyor type of drier which can perform drying efficiently and can effectively prevent the diffusion of stenchy matter, etc., in one which dries half solid or solid matter containing water such as excrementitious matter, strained lees, etc., while carrying it.

A gas combustion chamber 3 in the shape of a dual cylinder is arranged to cover the periphery of a carrying barrel 2, and it is arranged so that the exhaust gas from this may pass the hollow axis 11 with a large diameter of a screw shaft and that it may pass the jacket 36 of a spare reservoir tank 25. Moreover, the mixed gas 2:1 in volume ratio between hydrogen and oxygen is used as combustion gas.