To provide a grinding device which permits a workpiece to be ground by fixing it without causing a runout, and small grooves to be generated along the axial direction.

The grinding device is provided with a workpiece support ring 10 which holds an end of the workpiece W on the center axis, a connection ring 30 through which the workpiece support ring 10 is put on the center axis to be supported and on which a connection arm 20 is extruded from the peripheral, and an automatic indexing/fixing ring 50 on which the connection ring 30 is secured on the center axis and an adjusting section 40 is located on the peripheral in order to engage with and support the connection arm 30. And a spring ring 80 is fit between screws 60, 60... from the outer face of the peripheral of the connection ring 30 to a point of contact with the outer peripheral face of the workpiece support ring 10 for supporting the ring 10 and screws 70, 70 screwed to the adjust section 40 to a point of contact with the connection arm 20 so as to support the connection arm 20, in order to tie these screws with a tension.