Exposure apparatus and device fabrication method using the same

摘要

An exposure apparatus includes an original-form stage for holding an original form, a projection optical system for introducing light from the original form into an object to be exposed, and a detection optical system for detecting positions at plural points on the original form, in an optical-axis direction of the projection optical system, wherein a space for enclosing the original-form stage is different from a space for enclosing at least part of the detection optical system.