Manufacturing method for high-pressure tank and high-pressure tank

A high-pressure tank including a liner that stores gas, a first reinforcing layer that covers an outer surface of the liner and is formed as a plurality of split bodies fitted to each other, and a second reinforcing layer that covers an outer surface of the first reinforcing layer, wherein

• the split bodies are fitted to each other in a state where a resin intervening member is arranged between the neighboring split bodies;
• the plurality of split bodies are a cylindrical member, a valve-side dome member and an end-side dome member;
• a valve-side fitting end portion of the cylindrical member and an end-side fitting end portion of the cylindrical member are formed into a tapered shape such that thicknesses of the valve-side fitting end portion of the cylindrical member and the end-side fitting end portion of the cylindrical member are reduced gradually from an outer side towards an inner side of the high-pressure tank;
• a fitting end portion of the valve-side dome member fitted to the valve-side fitting end portion of the cylindrical member and a fitting end portion of the end-side dome member fitted to the end-side fitting end portion are formed into a tapered shape such that thicknesses of the fitting end portion of the valve-side dome member and the fitting end portion of the end-side dome member are gradually reduced from the inner side towards the outer side of the high-pressure tank;
• the valve-side dome member and the cylindrical member are fitted to each other in a state where the fitting end portion of the valve-side dome member is positioned on the outer side and the valve-side fitting end portion of the cylindrical member is positioned on the inner side;
• the resin intervening member has a Z-shaped section, and includes a first part, a second part and a third part;
• the first part is sandwiched between the fitting end portion of the valve-side dome member and the valve-side fitting end portion of the cylindrical member;
• the second part covers the fitting end portion of the valve-side dome member together with the first part;
• and
• the third part covers the valve-side fitting end portion of the cylindrical member together with the first part.