A papermaking screen capable of separating useful fibers and foreign substances while preventing the screens from clogging comprises: a tank (4) for a papermaking material; a cylindrical first screen (2) which separates the tank into a primary compartment (4a) and a secondary compartment (4b); a second screen (3); a rotary member (5) rotatably provided in the vicinity of the ceiling surface of the second screen (3); a stirring unit (6); wherein an inlet (41) and a first foreign substance outlet (43) communicate with a first chamber (4a1) provided in the primary compartment (4a) and formed outside the second screen (3), the dilution water supply port (45) communicates with a second chamber (4a2) surrounded by the outer and inner peripheral surface (32,34), and the ceiling surface (35) of the second screen (3), and the second foreign substance outlet (44) communicates with a third chamber (4a3) surrounded by the first screen (2), the inner peripheral surface (32) of the second screen (3), and the ceiling surface of the rotary member (5).