Abstract: A liquid container is screwed to tighten and seals strongly, and wherein torque reduction for opening the cap is controlled to prevent loosening the cap, preservation of a tightly-sealing property is improved, and content leak is prevented. The container includes: a body having a male screw on the mouth-neck section rising from the surface; and an anti-loosening cap having a female screw engaging with the male screw and a buffer seal material on the inner side of a top plate, a flange protruding from an open end portion of an outer cylinder skirt extending from the top plate, a resin cushion material protrusion on the flange and attached onto the outer surface of the flange, a height difference of the top plate inner surface to the protrusion top is larger than a height difference from a container opening end face of the mouth-neck to an outer surface portion and protrusion.

Abstract: A liquid container is screwed to tighten and seals strongly, and wherein torque reduction for opening the cap is controlled to prevent loosening the cap, preservation of a tightly-sealing property is improved, and content leak is prevented. The container includes: a body having a male screw on the mouth-neck section rising from the surface; and an anti-loosening cap having a female screw engaging with the male screw and a buffer seal material on the inner side of a top plate, a flange protruding from an open end portion of an outer cylinder skirt extending from the top plate, a resin cushion material protrusion on the flange and attached onto the outer surface of the flange, a height difference of the top plate inner surface to the protrusion top is larger than a height difference from a container opening end face of the mouth-neck to an outer surface portion and protrusion.