PROBLEM TO BE SOLVED: To provide a workpiece mounting method, a workpiece detaching method, a workpiece holder, a workpiece supporter and a workpiece mounting device in which a welding workpiece, in particular, a box-shaped workpiece can be easily mounted on/detached from a workpiece mounting device.;SOLUTION: A workpiece can be easily mounted on a workpiece mounting device by setting a workpiece holder 3 clamping a workpiece 1 to a workpiece supporter 4 attached to the workpiece mounting device, and the workpiece clamped by the workpiece holder can be easily detached from the workpiece supporter by detaching the workpiece holder from the workpiece supporter. A clamp part capable of clamping the workpiece and a fixing tool 42 for fixing the workpiece holder set to the workpiece supporter are provided on the workpiece mounting device.;COPYRIGHT: (C)2009,JPO&INPIT
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