METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE

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A problem of a resist mask collapse due to a plasma process is solved. In a method of manufacturing a semiconductor device including steps of a plasma process to a sample having a mask made of an organic material, the plasma process includes a first step of a plasma process under a gas containing any of fluorine, oxygen, or nitrogen, or containing all of them, and a second step of the plasma process under a gas containing a rare gas without containing any of fluorine, oxygen, and nitrogen, and the first step and the second step are repeated.