Provided is the production of a cheese starting material milk, said production having no risk of affecting the flavor of the cheese, having low energy consumption, having no risk of bacteria accumulating within a centrifugal separator, increasing the bacteria elimination rate of the centrifugal separator, and not requiring a large capacity centrifugal separator.[Solution] The present invention is provided with a first centrifugal separator (3) that separates milk (1) into a cream fraction (5) and a skim milk fraction (6) a microfilter (11) that separates the skim milk fraction (6) into a permeate (14) and a retentate (15) a second centrifugal separator (18) that separates the retentate (15) into a clean fraction (20) and a high bacteria content sludge (21) and a means for returning the clean fraction (20) to the microfilter (11), and the cream fraction and the permeate are combined to obtain the cheese starting material milk (26).
