In this study, we try to develop a new method for producing the bulk metallic glasses by using electromagnetic vibrations and to clarify a possibility of enhancing glass-forming ability by this process. The effects of the electromagnetic vibrations on the glass-forming ability in the Mg-based bulk metallic glasses were investigated. It was found that the new method by using the electromagnetic vibrations is effective in enhancing the glass-forming ability. Disappearance of the clusters by the electromagnetic vibrations applied to the liquid state was presumed to cause suppression of crystalline nucleation, namely, enhancing the glass-forming ability.