PURPOSE: To make a workpiece hardly jam in a workpiece transfer device at a transfer process, and make the device compact.

CONSTITUTION: This device comprises a tubular body 1 to form a water passage for transferring a workpiece W and water for carrying the workpiece W, a water pump 2 to generate a water flow F1 in the tubular body 1, a plurality of fins 3 to generate a vortex F2 in the water running through the tubular body 1, and a workpiece separation device 4 to separate the workpiece W from the water.