PURPOSE: To perform a fast, complete drying under a low-vacuum by coating a work supporting jig and/or a work container with a heat-resistant, waterproof membrane with a high infrared ray absorption, or forming it of a heat resistant, waterproof material with high infrared ray absorption.

CONSTITUTION: A stand 5 is set up in a vacuum chamber 1 so that works 4 are placed in the middle between upper and lower infrared ray heaters 2. The table of the stand 5 is netted using stainless wire and its surface is coated with a waterproof, heat resistant membrane with a high infrared ray absorption. A work container 6 such as a bucket which contains the works 4 is put on the stand 5. As raw material of a reflector is excellent in heat conduction, the works 4 can be easily heated up to boiling point or higher when contact points to the work container 6 with a high infrared ray absorption are ensured. In the case the works 4 are of an absorber such as a resin film, moisture can be evaporated by direct heating alone.