To provide a drying treatment device capable of shortening the time of drying cycle of a matter to be dried and excellent in a thermal efficiency.

An evacuating vessel 1 including a treatment tank 4 and connected to a suction pipe 13 communicated with an evacuating suction pump and having a heating means or an oil heater 5, and an opened vessel 2 opened into external atmosphere and having a heating means or another oil heater 23, are provided. The treatment tank 4 is communicated with the opened vessel 2 so as to be capable of being sealed by an opening and closing mechanism or an opening and closing door 3. A transfer means or a push-out plate 21 for moving the matter to be dried or the waste H in the treatment tank 4 into the opened vessel 2 is provided in the treatment tank 4.