PRESSURE VESSEL

Disclosed is a pressure vessel including a boss tail portion including a boss extension portion having a cylindrical shape and a boss flange portion integrally expanding outward in a radial direction along a circumferential direction above the boss extension portion, a liner portion having a container shape in which an accommodation space is formed to accommodate a fluid therein and a bottom is sealed and coupled, through integral insertion-injection molding, along atop surface of the boss flange portion, and a composite cover portion provided to surround an outer surface of the liner portion and to have a bottom end sealed and coupled while surrounding a bottom surface of the boss flange portion and an outer surface of the boss extension portion.