To provide an energy saving bed mattress exclusive drier carrying out low temperature boiling, sterilization, and stationary drying by maintaining a predetermined degree of vacuum in a drying chamber, and substantially extending a service life of a mattress with almost no damage and deterioration.

A drying chamber interior is lowered to the predetermined degree of vacuum by a vacuum pump to provide a boiling point of water at 60°C. A temperature in the drying chamber is raised to 60°C, air heated by an air heating heater is taken in from a body bottom while maintaining the predetermined degree of vacuum, and the bed mattress is dried while bleeding saturated steam generated in the drying chamber to an exterior by the vacuum pump.

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