To provide a blow-molding container in which an elongated neck continuously connected to a barrel section can be easily cut away at the midway part of it.

This container is comprised of a barrel section 1; a neck section 2 continuously connected with the barrel section 1; a cut section 4 formed to be wound around the neck section 2; and a knob piece 5 formed to be adjacent to the cut section 4 at the neck section 2 of the tip side from the cut section 4. The cut section 4 is torn out with the knob piece 5 to open an easily openable blow-molding container. In this case, the inner surface of the cut section 4 is comprised of two surfaces crossed to each other at the deepest part of the cut section 4 and at least one of the two surfaces is a curved surface bulged outside.