To provide a drum magnetic separator forming a strong magnetic field in a wide area and efficiently separating iron.

A pair of drums 1 and 2 are parallelly provided facing each other with an interval through which a sorting processing object passes from an upper part to a lower part. On the peripheral surface of one drum 1, an S pole and an N pole are alternately arranged. On the peripheral surface of the other drum 2, the N pole and the S pole to face the S pole and N pole of the drum 1 when both drums 1 and 2 are rotated are alternately arranged.