A plasma etching apparatus capable of performing processing with excellent in-plane uniformity on an object to be processed having a large diameter is provided. The present invention provides a plasma etching apparatus including a processing chamber 13 which performs plasma processing on an object to be processed 1, a first processing gas supply source 40, a second processing gas supply source 50, a first gas inlet 65-1 which introduces a processing gas into the processing chamber, second gas inlets 65-2 which introduce the processing gas into the processing chamber, flow rate regulators 42 and 53 which regulate the flow rate of the processing gas and a gas shunt 60 which divides the first processing gas into a plurality of portions, wherein at least two gas pipes branched by the shunt 60 are provided with the first gas inlet 65-1 or second gas inlets 65-2 and merging sections 63-1 and 63-2 are provided between the shunt 60 and the first gas inlet 65-1 and between the shunt 60 and the second gas inlets 65-2 for merging the second processing gas.