Abstract: A pressure vessel comprises a liner formed by blow-molding; an FRP layer covers the outer surface of the liner; and a stock comprising a stock main body, formed from metal with a cylindrical section passing through the liner and FRP layer and a circular metal flange section projecting outward from one end of the cylindrical section in the radial direction of the cylindrical section, and a molded piece, formed of a synthetic resin, covers at least the outer circumferential surface of the cylindrical section and all the metal flange section of the stock main body, has a circular resin flange section projecting outward from the edge of the metal flange section that faces outward in the radial direction, and adheres to the inner surface of the liner. The resin flange section comprises an upper surface, an outer circumferential edge surface and a lower surface.

Abstract: A pressure vessel comprises a liner formed by blow-molding; an FRP layer covers the outer surface of the liner; and a stock comprising a stock main body, formed from metal with a cylindrical section passing through the liner and FRP layer and a circular metal flange section projecting outward from one end of the cylindrical section in the radial direction of the cylindrical section, and a molded piece, formed of a synthetic resin, covers at least the outer circumferential surface of the cylindrical section and all the metal flange section of the stock main body, has a circular resin flange section projecting outward from the edge of the metal flange section that faces outward in the radial direction, and adheres to the inner surface of the liner. The resin flange section comprises an upper surface, an outer circumferential edge surface and a lower surface.