PURPOSE: To provide a workpiece supplying device which is capable of supplying ring-shaped workpieces in a continuous and accurate manner to a centerless grinder.

CONSTITUTION: A workpiece supplying device is provided with a pair of rollers 10, 11 which are separated from each other in parallel in the horizontal direction on the workpiece supplying side in a centerless grinder in such a manner as being inclined in the vertically opposite direction, and the distance (L) in the horizontal direction of the respective rollers 10, 11 is set in an adjustable manner. The supporting angle of a workpiece (W) is adjusted by appropriately adjusting the distance (L) of the respective rollers 10, 11. The feeding force of the workpiece (W) is determined by this supporting angle, and the forces acting on the workpiece (W) can be balanced in connection with the moment by adjusting this supporting angle, enabling continuous and accurate supply of workpieces (W) without inclination thereof.