Patent ID: 7993488

Claim:
A microwave plasma processing device processing 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 to introduce the microwave into said processing chamber; a valve element openably and closably blocking the opening; an exhauster evacuating 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 to hermetically seal a space therebetween while the opening is blocked by said valve element; and a groove-shaped microwave reflecting mechanism configured to reflect the microwave leaking to an outside from the opening while the opening is blocked by the valve element, the microwave reflecting mechanism being located so as to surround at least a periphery of the opening and being joined with a space formed by the hermetically sealing member between the outer atmospheric portion of a peripheral portion of said processing chamber opening and the valve element, wherein the microwave reflecting mechanism is provided in the valve element to surround an outer peripheral portion of said hermetically sealing member of the valve element.