Patent ID: 7182821

Claim:
A substrate processing method comprising: a substrate rotating step for rotating a substrate with the substrate held almost horizontally within a chamber, a peripheral edge processing step for discharging a processing liquid to a lower main surface of the substrate rotated in the substrate rotating step and causing the processing liquid to flow around to an upper main surface of the substrate at a peripheral edge thereof, around a peripheral end surface of the substrate which is defined between the upper surface and the lower surface of the substrates, to process the peripheral edge of the upper surface of the substrate in the chamber; and a both-surface processing step for discharging a processing liquid to both the main surfaces of the substrate rotated in the substrate rotating step to process both the main surfaces of the substrate in the chamber; wherein the processing liquid used in the peripheral edge processing step and the processing liquid used in the both-surface processing step include a same etchant, wherein said etchant is used in the both-surface processing step with a lower concentration than the etchant concentration used in the peripheral edge processing step.