A workpiece changer configured to replace a ring-shaped workpiece (W) between a replacement position (P2) of the workpiece (W) and a processing position (P1) for processing the workpiece (W), the workpiece changer comprising: a loading member rotatably supported about a rotation shaft , the loading member provided with workpiece holding portions configured to hold the workpiece (W) 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 (S1) in which the workpiece holding portions are respectively disposed at the replacement position (P2) and the processing position (P1) and a workpiece retracted state (S2) in which the workpiece holding portions are disposed away from the replacement position (P2) and the processing position (P1), characterized in that a shoe configured to support an outer circumference of the workpiece (W) is disposed at the processing position (P1), and wherein while the loading member supporting mechanism moves the loading member from the workpiece set state (S1) to the workpiece retracted state (S2) and returns to the workpiece set state (S1) again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position (P1) to the replacement position (P2) and an operation of disposing the workpiece holding portion disposed at the replacement position (P2) to the processing position (P1) 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 (W) 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 (S1) in which the workpiece holding portions are respectively disposed at the replacement position (P2) and the processing position (P1) and a workpiece retracted state (S2) in which the workpiece holding portions are disposed away from the replacement position (P2) and the processing position (P1), characterized in that a shoe configured to support an outer circumference of the workpiece (W) is disposed at the processing position (P1), and wherein while the loading member supporting mechanism moves the loading member from the workpiece set state (S1) to the workpiece retracted state (S2) and returns to the workpiece set state (S1) again, the displacement drive unit and the rotation drive unit perform an operation of disposing the workpiece holding portion arranged at the processing position (P1) to the replacement position (P2) and an operation of disposing the workpiece holding portion disposed at the replacement position (P2) to the processing position (P1) in a trajectory in which the loading member does not interfere with the shoe . <EOS>