Disclosed is a substrate processing apparatus. The substrate processing apparatus includes a first nozzle that ejects droplets of a chemical liquid toward a front surface of a substrate, the droplets being formed by mixing a gas supplied by a gas supply mechanism and a heated chemical liquid supplied by a heated chemical liquid supply mechanism with each other, and a second nozzle that ejects the heated deionized water supplied by the heated deionized water supply mechanism toward the rear surface of the substrate. The first nozzle supplies the droplets to the front surface of the substrate heated from the rear surface thereof by the heated deionized water supplied from the second nozzle.