A slide fastener element polishing device (1, 101) for polishing a fastener element in a slide fastener which has a fastener tape and the fastener element attached to the fastener tape, the fastener element having a front surface and a back surface, the polishing device (1, 101) comprising: a transport path for the slide fastener; a support part (3, 3a, 13) arranged along the transport path and arranged to face the back surface of the fastener element to support a posture of the fastener element; and a polishing part arranged to face the support part (3, 3a, 13) across the transport path, wherein the polishing part is fixed to a column protruding upward from a top surface of a base, the polishing part comprises: a motor fixed to the column; a rotation shaft, connected to the motor, located on an output end side of the motor in a posture extending downward, and configured to be rotated by driving the motor; a plate body fixed to a leading end of the rotation shaft, the plate body being a circular plate extending radially from the center of the rotation shaft in a direction perpendicular to an axial direction of the rotation shaft, the plate body configured to rotate together with the rotation shaft in a horizontal plane by rotating the rotation shaft; a polishing member being rotatable by rotating the rotation shaft, and the polishing member is configured to come in contact with the front surface of the fastener element and polish the front surface of the fastener element, and the rotation shaft for the polishing member extends parallel to a direction perpendicular to the support part (3, 3a, 13) the polishing device being characterized by comprising a protrusion fixed to a peripheral edge portion of the plate body and protruding downward from a bottom surface of the plate body; the polishing member being fixed to a leading end of the protrusion and the support part (3, 13) is a roller (31, 131, 132) having a rotation shaft extending in a direction perpendicular to the rotation shaft of the polishing part and being rotatable about the rotation shaft. a transport path for the slide fastener; a support part (3, 3a, 13) arranged along the transport path and arranged to face the back surface of the fastener element to support a posture of the fastener element; and a polishing part arranged to face the support part (3, 3a, 13) across the transport path, wherein the polishing part is fixed to a column protruding upward from a top surface of a base, the polishing part comprises: a motor fixed to the column; a rotation shaft, connected to the motor, located on an output end side of the motor in a posture extending downward, and configured to be rotated by driving the motor; a plate body fixed to a leading end of the rotation shaft, the plate body being a circular plate extending radially from the center of the rotation shaft in a direction perpendicular to an axial direction of the rotation shaft, the plate body configured to rotate together with the rotation shaft in a horizontal plane by rotating the rotation shaft; a polishing member being rotatable by rotating the rotation shaft, and a motor fixed to the column; a rotation shaft, connected to the motor, located on an output end side of the motor in a posture extending downward, and configured to be rotated by driving the motor; a plate body fixed to a leading end of the rotation shaft, the plate body being a circular plate extending radially from the center of the rotation shaft in a direction perpendicular to an axial direction of the rotation shaft, the plate body configured to rotate together with the rotation shaft in a horizontal plane by rotating the rotation shaft; a polishing member being rotatable by rotating the rotation shaft, and the polishing member is configured to come in contact with the front surface of the fastener element and polish the front surface of the fastener element, and the rotation shaft for the polishing member extends parallel to a direction perpendicular to the support part (3, 3a, 13) the polishing device being characterized by comprising a protrusion fixed to a peripheral edge portion of the plate body and protruding downward from a bottom surface of the plate body; the polishing member being fixed to a leading end of the protrusion and the support part (3, 13) is a roller (31, 131, 132) having a rotation shaft extending in a direction perpendicular to the rotation shaft of the polishing part and being rotatable about the rotation shaft.