A substrate processing apparatus comprises an indexer block, an anti-reflection film processing block, a resist film processing block, a development processing block, and an interface block. An exposure device is arranged adjacent to an interface block. The interface block comprises a drying processing group including two drying processing units and an interface transport mechanism. After a substrate is subjected to exposure processing by the exposure device, the substrate is transported to the drying processing units in the drying processing group by the interface transport mechanism, where the substrate is subjected to cleaning and drying processings.