High pressure tank

A high pressure tank comprising:

• a liner made of a resin;
• a reinforced layer covering an outer surface of the liner;
• and a cap having formed therein a supplying and discharging hole for supplying a fluid to the liner or discharging the fluid from the liner,
• the liner including a sunken section at one end of the liner, the sunken section toward another end of the liner,
• the cap including:
• a flange section interposing between the sunken section and the reinforced layer;
• and an exposed section exposed from the reinforced layer, and
• there being arranged between the flange section and the reinforced layer a protective member filled into a clearance between the flange section and the reinforced layer,
• wherein a circumferential edge section of the flange section is provided with:
• a first corner section facing the liner;
• a second corner section facing the reinforced layer;
• and a flat side surface extending from the first corner section to the second corner section,
• angles of the first corner section and the second corner section are obtuse angles,
• the protective member includes:
• a circular ring-shape main body section formed in a substantially circular ring-like shape;
• and a ring-shaped projection projecting from an end surface of the circular ring-shaped main body section and having a substantially triangular shape in cross section, the end surface of the circular ring-shaped main body section facing the sunken section,
• the circular ring-shaped main body section includes a first sandwiched region sandwiched between the flange section and the reinforced layer, and a second sandwiched region sandwiched between the liner and the reinforced layer,
• the ring-shaped projection is positioned between the first sandwiched region and the second sandwiched region, and the ring-shaped projection abuts against the flat side surface on a first ring-shaped projection surface extending through one side forming a vertex of the substantially triangular shape, and abuts against an outer surface of the sunken section on a second ring-shaped projection surface extending through another side forming the vertex of the substantially triangular shape.