Patent ID: 8171880

Claim:
A microwave plasma processing apparatus which performs plasma processing on an object using plasma generated by microwaves emitted from a radial line slot antenna (RLSA), the apparatus comprising: a processing container in which plasma processing is performed; a microwave source outputting microwaves; a rectangular waveguide transmitting the microwaves outputted from the microwave source; a coaxial converter converting a mode of the microwaves transmitted to the rectangular waveguide; and a coaxial waveguide including an inner conductor slidably and electrically connected to the coaxial converter by a first contact member; wherein the first contact member is fixed to the coaxial converter and slidably contacts the inner conductor to thereby slidably and electrically connect the coaxial converter and the inner conductor to each other; and a first spring member disposed between a fixing member fixing the inner conductor and a cover portion covering the coaxial converter, the first spring member absorbing displacement, which is caused by a thermal expansion, of the RLSA and a member disposed above the RLSA.