To highly reliably and efficiently carry out a series of operations for collecting a sample piece from a rubber sheet extruded continuously, and transferring the sample piece to a measuring instrument.

The rubber sheet G from an extruder 2 is passed through between a cutter receiving block and an elevatable blanking cutter 5 arranged in an upper side thereof, and the sample piece Gs is blanked from the rubber sheet G into a cylindrical hole 5A of the blanking cutter 5, between the cutter receiving block and the blanking cutter 5, by lowering the blanking cutter 5. The sample piece Gs in the cylindrical hole 5A is sucked by a vacuum pad 7, and is conveyed to a sample transfer position provided in a sample measuring means.