Abstract: In a horizontal grinding-type rice polishing machine which is so configured that a grinding roller (1) installed circularly and fixedly on a horizontal rotation axis (10) is covered with a concentric cylindrical bran removing screen (S) that can be split into longitudinal two screen halves (2) to thereby form a rice polishing room, the total of even number of a stopper (3) and a flap (4) are fixedly provided on an inner peripheral surface of each of two-part split screen halves (2) of the bran removing screen (S) so that they align alternately in the axial direction, the stopper (3) and the flap (4) being formed by a circular arc member which curves along the circumference of a circular cross section perpendicular to the axial center of the cylinder.