Patent ID: 8293067

Claim:
A microwave plasma processing device configured to process an object to be processed by plasma generated by a microwave, comprising: a processing chamber having an opening to carry the object to be processed in and out; a microwave introducing mechanism configured to introduce the microwave into said processing chamber; a valve element configured to move into a position to block the opening; an exhauster configured to evacuate the processing chamber; a hermetically sealing member, between an outer atmospheric portion of a peripheral portion of the opening of said processing chamber and the valve element, configured to hermetically seal a space therebetween when the opening is blocked by said valve element; and a groove-shaped microwave reflecting mechanism located so as to surround at least a periphery of the opening and configured to reflect the microwave leaking to an outside from the opening when the opening is blocked by the valve element, the microwave reflecting mechanism being provided in the processing chamber, wherein the microwave reflecting mechanism is provided at an outer peripheral portion of said hermetically sealing member when the opening is blocked by the valve element, and wherein a distance from an end of the opening to an end of the microwave reflecting mechanism is more than 5 mm.