To convey workpieces to an after process while stocking them, attain labor saving, miniaturize a device, and make a layout arranging a machine tool compact.

A turn table 11 arranging a plurality of mounting parts 12 is arranged in the intermediate between two machine tools 20, 30, a measuring means 14 for measuring dimensional accuracy of workpieces 40 is arranged, and the workpieces 40 successively mounted in each mounting part 12 from the machine tool 20 in the preceding process are measured by the measuring means 14 in each prescribed quantity. After a stock in the turn table 11 till completion of good or bad judgement based on a measurement result, the workpiece 40 judged to be a good product is successively taken out from each mounting part 12 toward the machine tool 30 in the after process, so that the workpieces 40 can be conveyed between the machine tools, necessity for a separate conveyer is eliminated, labor saving is attained, and the device is compact as compared with a pallet and a transfer loading conveyer, an arrangement space of the machine tools can be lessened, a cost can be reduced.