The invention relates to a die. The invention provides a die to make sure the service life and suppress the occur of blanking burr in a blanking process of the flexible PCB. A die is used for the planking process of the flexible PCB. A flexuous concavo-convex part viewed from side surface is continuously formed on the bottom of the die, and, in the whole surface of the bottom, the concavo-convex part is fixed in a slant parallel manner viewed from the bottom.