To prevent the occurrence of waste and pollution at the time of unseal of an ampule, to eliminate the possibility of injure of a worker, and to enhance high transparancy, high dampproofing, high heat-resisting deformability, and the easiness of transportation, storage, and handling, and also the chemical resisting properties of the ampoule.

An amorphous resin-made ampule 1 is an amorphous olefine copolymer resin making a molecular main chain of a general ring structure, or a resin-made ampule of a bottomed cylindrical shape making a pricipal component of the amorphous copolymer resin of olefine and ethylene, and it is provided with a cut neck part NC positioned nearly in the middle stage region of the outer wall, and an upper flange 12f at least on the cutoff part 12 side in the position where the cut neck part NC is placed therebetween, and also a liquid housing part 13 that is made of a resin preform provided with at least prescribed thickness region formed so as to have nearly the same thickness as the lower flange 13f and that is swelled to have a prescribed volume by the hydraulic pressure applied to its interior at a prescribed temperature. The cross-sectional shape thereof is made to be circular, as well as elliptic, and polygonal shape.