A plasma processing apparatus includes a process chamber, and a pedestal provided in the process chamber and configured to hold a substrate. The plasma processing apparatus includes a first gas supply part configured to be able to supply a first gas from a location facing the pedestal, and a radio frequency power source configured to convert the first gas to plasma. A shield part to block the first gas converted to plasma is provided around the pedestal. The plasma processing apparatus further includes an evacuation part configured to evacuate the process chamber through the shield part, and a second gas supply part configured to be able to supply a second gas to a space between the shield part and the evacuation part.