An exposure apparatus has a projection optical system configured to project a pattern of a reticle onto a substrate, and exposes the substrate to light via the reticle and the projection optical system with a space between the projection optical system and the substrate filled with liquid. The apparatus includes a supply nozzle configured to supply liquid to the space, a supply path configured to supply the liquid to the supply nozzle, a bypass which branches from the supply path, and a supply control valve configured to change a flow rate of the liquid supplied from the supply path to the supply nozzle and a flow rate of the liquid supplied from the supply path to the bypass.