A substrate processing method is for forming a metal film on a target substrate by using a plasma. The method includes loading a target substrate having a silicon-containing layer on a surface thereof into a processing chamber which is pre-coated by a film containing a metal, introducing hydrogen gas and a gaseous compound of the metal and halogen into the processing chamber, generating a plasma, and forming a metal film on the target substrate. The method further includes performing a first reduction process of forming an atmosphere of a plasma obtained by activating hydrogen gas in the processing chamber, unloading the target substrate from the processing chamber, performing a second reduction process of forming an atmosphere of a plasma obtained by activating hydrogen gas in the processing chamber, and loading a next target substrate into the processing chamber.