A workpiece changer (200, 200A, 200B) configured to replace a ring-shaped workpiece between a replacement position of the workpiece and a processing position for processing the workpiece, the workpiece changer (200, 200A, 200B) comprising: a loading member rotatably supported about a rotation shaft, the loading member provided with workpiece holding portions configured to hold the workpiece at at least two radially outer edge portions; a loading member supporting mechanism configured to movably support the loading member in a plane perpendicular to an axial direction of the rotation shaft; a rotation drive unit configured to rotationally drive the loading member about the rotation shaft; and a displacement drive unit configured to drive and displace the loading member supporting mechanism between a workpiece set state in which the workpiece holding portions are respectively disposed at the replacement position and the processing position and a workpiece retracted state in which the workpiece holding portions are disposed away from the replacement position and the processing position, characterized in that a shoe configured to support an outer circumference of the workpiece is disposed at the processing position, and wherein while the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe. a loading member rotatably supported about a rotation shaft, the loading member provided with workpiece holding portions configured to hold the workpiece at at least two radially outer edge portions; a loading member supporting mechanism configured to movably support the loading member in a plane perpendicular to an axial direction of the rotation shaft; a rotation drive unit configured to rotationally drive the loading member about the rotation shaft; and a displacement drive unit configured to drive and displace the loading member supporting mechanism between a workpiece set state in which the workpiece holding portions are respectively disposed at the replacement position and the processing position and a workpiece retracted state in which the workpiece holding portions are disposed away from the replacement position and the processing position, characterized in that a shoe configured to support an outer circumference of the workpiece is disposed at the processing position, and wherein while the loading member supporting mechanism moves the loading member from the workpiece set state to the workpiece retracted state and returns to the workpiece set state again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position to the replacement position and an operation of disposing the workpiece holding portion disposed at the replacement position to the processing position in a trajectory in which the loading member does not interfere with the shoe.