An exposure apparatus which exposes a pattern of an original onto a substrate through a projection optical system with a space between the projection optical system and the substrate filled with liquid. The apparatus includes a liquid supply nozzle configured to supply the liquid to the space through a liquid supply opening, a liquid supply unit configured to supply the liquid into the liquid supply nozzle, a liquid recovery unit configured to recover the liquid in the liquid supply nozzle by using a vacuum source, and a gas supply unit configured to supply a gas into the liquid supply nozzle through a pipe connected to the liquid supply opening of the liquid supply nozzle. A gas supply by the gas supply unit is started and a liquid recovery by the liquid recovery unit is started while a liquid supply by the liquid supply unit is stopped.