The present invention relates to a technology for depositing a thin metal film by using a plasma sputtering technique on a top surface of a target object, e.g., a semiconductor wafer or the like, and on a surface of a recess opened at the top surface. The film deposition method is characterized in that a film deposition process to deposit a metal film on a sidewall of the recess by generating metal ions by way of making a metal target sputter with a plasma generated from a discharge gas in the processing container and by applying to the mounting table a bias power to cause a metal film deposition based on a metal ion attraction and a sputter etching based on the plasma generated from the discharge gas simultaneously on the top surface of the target object.