A filter device for a washing machine includes a circulation flow path frame on an inner wall of a washing tub, having a first overflow path between the circulation flow path frame and the inner wall of the washing tub; and a filter unit in the circulation flow frame, having a second overflow path between the filter unit and the circulation flow path frame to communicate with the first overflow path. Wash water entering the first overflow path is discharged into the washing tub through a discharge port of the first overflow path and a discharge port of the second overflow path, and the discharge port of the second overflow path is under the discharge port of the first overflow path.