Pressure container

A pressure container comprising:

• a mouthpiece including a boss portion which has a cylindrical shape and a flange portion which protrudes toward a radially outer side from the boss portion;
• and
• a liner which is made of resin and is integrated with the flange portion of the mouthpiece to define an internal space together with the mouthpiece,
• wherein
• the flange portion has an inner surface that faces the internal space,
• the liner includes a covering portion that covers at least one part of the inner surface over an entire circumference of the inner surface of the flange portion,
• a covering opposing portion, which is the inner surface of the flange portion and is covered with the covering portion, includes a holding groove and a seal groove provided on a radially outer side of the flange portion than on the holding groove,
• at an axial cross-section parallel to a center axis of the boss portion, 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, and
• the covering portion includes a holding rib fitted into the holding groove so as to be movable forward and backward within the holding groove, and a seal rib fitted into the seal groove.