Abstract: A thin-film slicer is disclosed that comprises a base; a sample holder; a cutting blade; and a feeder, wherein the sample holder and the cutting blade are placed at predetermined angles with respect to the base; the sample holder sandwiches the sample surfaces of the thin film at a portion other than a portion to be cut; the cutting blade is provided movably in a straight line in a direction that forms the predetermined angle with respect to the direction of the sample surfaces of the thin film, and cuts the thin film held by the sample holder from a sample-surface side; and the feeder feeds the cutting blade in a straight line in the direction that forms the predetermined angle with respect to the sample surfaces of the thin film held by the sample holder.