Patent ID: 8652268

Claim:
A substrate treating method for treating substrates with treating liquids, comprising the steps of: holding a substrate in a spin holding mechanism in a treating unit and spinning the substrate in a horizontal posture; supplying a first treating liquid to the substrate spun by said spin holding mechanism to treat the substrate with the first treating liquid covering entire surfaces of the substrate; supplying a second treating liquid to the substrate spun by said spin holding mechanism to treat the substrate with the second treating liquid covering the entire surfaces of the substrate, the second treating liquid having lower surface tension than the first treating liquid, and higher boiling point than the first treating liquid, while controlling the second treating liquid to be in a temperature range above the boiling point of the first treating liquid and below the boiling point of the second treating liquid; supplying, after substrate treatment with the second treating liquid, a third treating liquid of lower surface tension than the first treating liquid, and lower boiling point than the second treating liquid, to the substrate spun by said spin holding mechanism, to treat the substrate with the third treating liquid covering the entire surfaces of the substrate; and after treating the substrate with the third treating liquid, controlling said spin holding mechanism to spin-dry the substrate.