Workpiece position determination device, laser machining device, and workpiece position determination method

A workpiece position determination device comprising:

• an imager;
• a driver to cause the imager to move relative to a workpiece including a planar surface, in a planar direction parallel or substantially parallel to the planar surface;
• a controller configured or programmed to control the driver so that the imager moves along a prescribed trajectory that passes through a plurality of locations in a boundary portion in the planar surface in a plan view;
• and
• a storage to store image information captured by the imager while the imager moves along the prescribed trajectory, and coordinate information of the imager at a time of capturing each image information;
• wherein
• the controller is configured or programmed to define and function as:
• a position determiner to determine the position of the workpiece in the planar direction corresponding to the boundary portion, based on the image information and the coordinate information stored in the storage;
• and
• an offset determiner to determine an offset of the workpiece from a reference position, based on a determination result from the position determiner.