Patent ID: 8093158

Claim:
A semiconductor device manufacturing method comprising: a first process of forming a film containing a predetermined element on a substrate by supplying a source gas containing the predetermined element to a substrate processing chamber in which the substrate is accommodated; a second process of removing the source gas remaining in the substrate processing chamber by supplying an inert gas to the substrate processing chamber; a third process of modifying the predetermined element-containing film formed in the first process by supplying a modification gas that reacts with the predetermined element to the substrate processing chamber; a fourth process of removing the modification gas remaining in the substrate processing chamber by supplying an inert gas to the substrate processing chamber; and a filling process of filling an inert gas in a gas tank connected to the substrate processing chamber, wherein the filling process is performed before each of the second process and the fourth process, and in each of the second process and the fourth process, the inert gas filled in the gas tank in the filling process is supplied to the substrate processing chamber.