To provide a technique capable of performing changeover of a clamp member in accordance with the kind of a workpiece to be processed, at a lower cost and by a simpler method than those of the prior art.SOLUTION: A workpiece clamping device 40 comprises: a bracket 46; a movable part 52 movably mounted on the bracket 46; clamp members 80 and 82 mounted on or de-mounted from the bracket 46 or the movable part 52 for clamping a workpiece; and mounting and de-mounting devices 106 and 108 for connecting the bracket 46 or the moveable part 52 and the clamp members 80 and 82 removably from each other.SELECTED DRAWING: Figure 1
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