A method of manufacturing a flexible die, comprising the steps of forming a flexible base (1) and a projected part (projected part (21) formed in a trapezoidal shape in cross section) projected from the base by etching, forming a vertical projected part (2b) by cutting the side faces of the projected part (21), and forming a press-cut blade (2) by shaping the blade tip (2a) of a double-edge (or single-edge) at the tip of the vertical projected part (2b).