A substrate is held and rotated by a spin chuck, and a coating liquid is discharged to the substrate. The coating liquid that is splashed outwardly from the substrate is received by an outer cup. A cleaning liquid that has been discharged from a cup cleaning nozzle is discharged to an inner peripheral surface of the outer cup through a first guide to clean the outer cup. Thus, the coating liquid, its solidified matter and the like adhering to the outer cup are dissolved and removed from the outer cup. Subsequently, a metal removal liquid that has been discharged from the cup cleaning nozzle is discharged to an inner peripheral surface of the outer cup through a second guide. Thus, a metallic component remaining on the outer cup is dissolved and removed from the outer cup.