Abstract: A liner includes a covering portion that covers an inner surface over the entire circumference of the inner surface of a flange portion of a mouthpiece. A covering opposing portion, which is the inner surface of the flange portion and covered with the covering portion, includes a holding groove and a seal groove on the radially outer side of the flange portion. In an axial cross-section of a pressure container, the holding groove extends, from its groove opening toward groove bottom, in a direction inclined toward a radially inner side of the flange portion with respect to a boss portion axial direction, and the seal groove extends, from its groove opening toward groove bottom, in a direction different from the direction of the holding groove. The covering portion includes a holding rib fitted into the holding groove and movable therein, and a seal rib fitted into the seal groove.

Abstract: A liner includes a covering portion that covers an inner surface over the entire circumference of the inner surface of a flange portion of a mouthpiece. A covering opposing portion, which is the inner surface of the flange portion and covered with the covering portion, includes a holding groove and a seal groove provided on the radially outer side of the flange portion than on the holding groove. At an axial cross-section of a pressure container, the holding groove is provided to extend, from a groove opening toward a groove bottom, in a direction inclined toward a radially inner side of the flange portion with respect to an axial direction of the boss portion, and the seal groove is provided to extend, from the groove opening toward the groove bottom, in a direction different from a direction in which the holding groove extends.

Abstract: A high-pressure gas container is provided with a hollow liner portion made of resin and a regulating portion disposed on the outer peripheral side of the liner portion. Reinforcing ribs projected toward the hollow inside of the liner portion and used for reinforcing the liner portion are provided integrally with the liner portion on the inner peripheral side of the liner portion. Providing the reinforcing ribs results in increasing the strength of the high-pressure gas container. Moreover, providing the reinforcing ribs integrally with the liner portion makes it possible to reduce not only the number of parts and that of manufacturing man-hours required to produce the high-pressure gas container, so that the high-pressure gas containers are producible less costly.