Patent ID: 8092642

Claim:
A plasma processing apparatus comprising: a processing vessel which has a top opening and is made of metal; a dielectric plate disposed to close the top opening of the processing vessel; a microwave supply source of which ground side is connected with the processing vessel, for supplying a microwave; a flat plate slot antenna which is installed on top of the dielectric plate, for supplying the microwave from the microwave supply source to an inside of the processing vessel by transmitting it through the dielectric plate and generating plasma inside the processing vessel; and a conductive member which makes direct contact between substantially an entire circumference of the inner wall of the processing vessel and an outer periphery of the flat plate slot antenna, wherein the microwave flows from the flat plate slot antenna to the inner wall portion of the processing vessel via the conductive member, so that the microwave flowing in the flat plate slot antenna is allowed to be uniform.