High-pressure vessel

A high-pressure vessel comprising:

• a liner including a trunk portion and converging portions located at opposite ends of the trunk portion;
• and
• a plurality of fiber layers formed by winding a band-shaped fiber a plurality of times around an outer wall of the liner;
• wherein the plurality of fiber layers are laminated in a direction away from the liner to thereby form a reinforcement layer,
• the plurality of fiber layers include a plurality of hoop layers and a plurality of helical layers with each of the fiber layers being one of the hoop layer in which the band-shaped fiber is wound around the outer wall of the liner in a hoop winding manner and the helical layer in which the band-shaped fiber is wound around the outer wall of the liner in a helical winding manner,
• the plurality of helical layers include a plurality of low helical layers and a plurality of high helical layers with each of the helical layers being one of the low helical layer in which an inclination angle of the band-shaped fiber with respect to a longitudinal direction of the trunk portion is equal to or smaller than a first angle and the high helical layer in which the inclination angle of the band-shaped fiber with respect to the longitudinal direction of the trunk portion is larger than the first angle,
• and
• in at least two sequential low helical layers of the plurality of low helical layers in a layering direction, when the inclination angle of the band-shaped fiber is equal to or less than a second angle, a difference between a diameter of an opening formed in an end portion of a first layer of the at least two sequential low helical layers and a diameter of an opening formed in an end portion of a second layer of the at least two sequential low helical layers is equal to or greater than a width of the band-shaped fiber.