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Patent Granted [PROBLEMS] To provide a microwave transmission line which uses a coaxial tube. [MEANS FOR SOLVING PROBLEMS] A plasma processing apparatus (10) splits a microwave, which is transmitted to a coaxial tube (600) from a microwave source (900) through a splitting waveguide tube (905), by a splitting plate (610) into a plurality of microwaves and transmits the microwaves to internal conductors (315a) of the coaxial tubes.