Method for manufacturing high-pressure tank and mandrel for use in method for manufacturing high-pressure tank

A method for manufacturing a high-pressure tank including a reinforcing layer in which rims of both ends of a tubular member and rims of a pair of dome members are joined to overlap each other in a radial direction, the method comprising:

• producing the dome members;
• and
• producing the tubular member, wherein the producing of the dome members includes:
• a step of producing a wound body having a spherical shell shape on a mandrel while rotating the mandrel;
• a step of curing a resin contained in the wound body;
• a step of shaving the wound body after the resin is cured while rotating the mandrel to reduce, toward a split line circling the wound body, thicknesses of the rims of the dome members to be obtained by splitting the wound body;
• a step of splitting the shaved wound body into the dome members by cutting the wound body along the split line;
• and
• a step of demolding the dome members from the mandrel.