In a substrate processing apparatus consisting of an indexer block and a processing block, a substrate is transported between the indexer block and the processing block by an indexer robot. The indexer robot includes two hands that are provided one above the other on a rotating stage. The other hand moves in a vertical direction to one hand. A difference in height between the one hand and the other hand can be adjusted so as to be equal to spacing between substrate storing grooves of a carrier where the substrate that is to be carried into the indexer block is stored. In addition, the difference in height between the one hand and the other hand can be adjusted so as to be equal to spacing between support plates of a substrate platform provided between the indexer block and the processing block.