Patent ID: 6922910

Claim:
An exposure apparatus which exposes a substrate with a light beam from a mask in a main body, comprising: a chamber in which the main body is provided and that has a plurality of air-conditioning chambers including a column chamber which houses a stage on which the substrate is placed, an exposure chamber which houses the main body, a mask transfer system housing chamber which houses a mask transfer system to transfer the mask, and a substrate transfer system housing chamber which houses a substrate transfer system to transfer the substrate, wherein a relational expression P C ≧P WL ≧P B ≧P RL is satisfied, where P C is a pressure of the column chamber, P B is a pressure of the exposure chamber, P RL is a pressure of the mask transfer system housing chamber, and P WL is a pressure of the substrate transfer system housing chamber; and a pressure detection device which detects pressure information with respect to the plurality of air-conditioning chambers.