Patent ID: 8461062

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: loading substrates stacked in multiple stages in horizontal posture to the inside of a processing chamber; processing the substrates, loaded into the process chamber; and unloading the processed substrates from the processing chamber, the step of processing the substrate comprising: a first process step of supplying a first processing gas with a first flow rate to the processing chamber through a first processing gas supply nozzle, and further supplying an inactive gas with a flow rate equal or greater than the first flow rate to the processing chamber through each nozzle of a pair of inactive gas supply nozzles configured to sandwich the first processing gas supply nozzle; a second process step of stopping a supply of the first processing gas and supplying the inactive gas through at least the pair of the inactive gas supply nozzles, after the first process step; a third process step of supplying a second processing gas to the processing chamber through a second processing gas supply nozzle, and further supplying the inactive gas to the processing chamber through at least the pair of the inactive gas supply nozzles, after the second process step; and a fourth process step of stopping a supply of the second processing gas, and supplying the inactive gas through at least the pair of the inactive gas supply nozzles, after the third process step.