Plasma processing

Patent Granted A ratio between gas conductances of a main gas passage and a plurality of branch gas passages is increased. A plasma processing apparatus is an apparatus for plasma-processing an object to be processed by exciting gas, and includes a processing container; a gas supply source for supplying a desired gas; a main gas passage distributing the gas supplied from the gas supply source; a plurality of branch gas passages connected to a lower stream side of the main gas passage; a plurality of throttle portions formed on the plurality of branch gas passages to narrow the branch gas passages; and one, two, or more gas discharging holes per each of the branch gas passages, for discharging the gas that has passed through the plurality of throttle portions formed on the plurality of branch gas passages into the processing container.