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. Between the flap (4) and the outer periphery of the grinding roller (1), a distance that allows passing of rice while restricting passing amount is secured, and a distance between the stopper (3) and the outer periphery of the grinding roller (1) prevents the rice from flowing. The screen halves (2) of the bran removing screen (S) have the same structure, and are so configured that when the respective ends in the axial direction are inverted, the stopper (3) and the flap (4) are inverted, and in the rice polishing machine, at least one screen half (2) can be arranged so that the respective ends in the axial direction are inverted. Also, position of a joint surface (J) between the screen halves (2) is variable in the circumferential direction about the rotation axis (10).