To attain smooth opening/closing of a sliding door at all times by cleaning a rail with a line groove arranged on a floor face always with the travel of a sliding door, and to positively exhibit a cleaning function even if adjusting the height position of a wheel particularly to the sliding door.

In this sash roller 1 for the sliding door, a runner 3 supporting the wheel 31 traveling on the rail 7 arranged on the floor face, in the projected state from a lower end face, is supported in a vertical position adjustable manner to a mounting case 2 to the sliding door 10 whose lower face 22 is opened, and a brush member 4 with a brush 42 erected at the lower face to abut on the rail 7 is swingably provided at the lower part of the runner 3.