A semiconductor processing device according to the present invention includes a process chamber having an inner space in which plasma is generated and a chuck unit disposed in the inner space and supporting a substrate processed by the plasma. The process chamber includes a first chamber portion and a second chamber portion that are opened from each other, and when the first chamber portion and the second chamber portion are closed together, the process chamber is provided with the inner space in which the plasma is generated. When the first chamber portion and the second chamber portion are opened from each other, the chuck unit is exposed to outside.