Patent ID: 7592256

Claim:
A method of forming a tungsten film on a surface of an object to be processed in a vessel capable of being vacuumized, the method comprising: forming a tungsten film by alternately repeating a reduction gas supplying process for supplying a reduction gas to the vessel and a tungsten gas supplying process for supplying a tungsten-containing gas to the vessel with an intervening purge process therebetween for supplying an inert gas to the vessel while exhausting the vessel, wherein the tungsten film is formed by alternately repeating the reduction gas supplying process for supplying the reduction gas to the vessel and the tungsten gas supplying process for supplying the tungsten-containing gas to the vessel while controlling the total pressure of the gases to be constant in the vessel throughout the step of forming the tungsten film, and wherein a reduction gas-supplying period of an initial reduction gas supplying process among the repeated reduction gas supplying processes for supplying a reduction gas to the vessel is set to be longer than that of the remaining reduction gas supplying processes for supplying a reduction gas to the vessel.