A substrate transfer apparatus that is designed provide an inclined transfer function that improves liquid saving efficiency of a process solution (developing solution) during the transfer of the substrate. The substrate transfer apparatus includes a first transfer unit for transferring a substrate, a second transfer unit spaced apart from an end of the first transfer unit, a third transfer unit disposed between the first and second transfer units and providing an inclined transfer that is capable of saving a developing solution adhered to the substrate during transfer of the substrate, and a transfer controller for controlling an inclined transfer angle and a connection state of the third transfer unit.