Patent ID: 7582845

Claim:
A microwave plasma processing device comprising: fixing means for fixing a substrate as a processing target on a central axis in a plasma processing chamber; exhausting means for depressurizing an inside and outside of the substrate; a metal processing gas supply member which is present in the substrate and forms a reentrant cylindrical resonating system along with the plasma processing chamber; and microwave introducing means for introducing a microwave into the plasma processing chamber to perform processing, wherein a microwave sealing member is provided at a substrate-holding portion of the fixing means, a distance (D) between the microwave sealing member and a surface of the fixing means positioned in the plasma processing chamber is 0 to 55 mm, and a distance (L) between the microwave sealing member and an end portion of the processing gas supply member satisfies the following relational expressions: A. in case of 0≦D<20 L= ( nλ/ 2+λ/8)−3+α B. in case of 20≦D≦35 L= ( nλ/ 2+λ/8)−(−0.060 D 2 +4.2 D− 57)+α C. in case of 35<D≦55 L= ( nλ/ 2+λ/8)−(−0.030 D 2 +2.1 D− 21)+α where n is an integer, λ is a wavelength of the microwave, and α is a fluctuation band considering an influence and the like of the substrate on an electric field and is ±10 mm.