Patent ID: 7567422

Claim:
A plasma processing apparatus comprising: a processing chamber that plasma-processes a processed substrate; a plasma generating unit that generates plasma in the processing chamber; a wafer stage which is mounted in the processing chamber and has an electrostatic chuck for holding the processed substrate; a DC power supply that applies an electrostatic attraction voltage to the electrostatic chuck; a current detector that detects a current value of leakage current flowing between the electrostatic chuck and the processed substrate; and an applied voltage controlling unit which sets a plurality of values of the leakage current during a substrate processing time, and which sets a plurality of attraction conditions of the processed substrate to the leakage current values to control the voltage applied to the electrostatic chuck and the applied time so that the leakage current has the set current values; and an attraction characteristic acquiring unit that acquires and stores a relationship between the leakage current and the applied voltage during the processing and displays the result.