PROBLEM TO BE SOLVED: To provide a superheated steam-drying machine capable of substantially reducing a device manufacturing cost and an operation cost. SOLUTION: A superheated steam-drying machine 2 is constituted such that an electric motor 10 of model H acting as an electric motor for a convection fan 8 is mounted within a drying chamber 4 to eliminate at all a complex mechanism for use in transmitting a rotating force or a wall seal, resulting in that a device manufacturing cost is substantially reduced. In addition, a large amount of air can be produced with a low electric power by the convection fan 8 having a propeller fan 12 directly connected to the electric motor 10, wherein an air pressure within the drying chamber 4 is kept less than an atmospheric pressure by a gas discharging fan 36 and some items D to be dried are efficiently dried also with superheated steam of 120 deg.C or lower temperature and energy supplied to a boiler 16 is also substantially reduced and in view of these reasons, an operation cost of the device is substantially reduced. Odor gas generated from the dried items D are removed with cold water showers 40A, 40B as water solution.
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