The characteristics of piercing a hole in amorphous alloy foil with a thickness of 0.025mm using explosive-impulsive pressure were investigated. The effects of the diameter of the die cavity and the impulsive pressure induced by explosion on the piercing of a hole were shown. The quality of the pierced holes was evaluated by means of the contour rate, that is, the ratio of the perfectly sheared contour length to the circumference of pierced holes. The contour rate approached 1.0 with increasing impulsive pressure for all diameters of the die cavity. The error in the diameter of pierced holes to the diameter of the die cavity was within 2%. Even for a small diameter, the optimum impulsive pressure distribution, i.e., the optimum amount of explosive and distance from the explosive to the specimen, enable holes to be pierced perfectly.