Method for manufacturing joined body

A method for manufacturing a joined body in which composite materials in which fibers are impregnated with resins are heated and joined to each other, the method comprising:

• a step of semi-curing the resins of the composite materials by aligning the composite material with each of a plurality of molding dies and heating the molding dies, the molding dies including a first molding die and a second molding die, and the composite materials include a first composite material and a second composite material;
• a step of joining the composite materials to each other by combining and heating the molding dies with which the composite materials are aligned after semi-curing the resins of the composite materials, wherein the molding dies used when semi-curing the resins of the composite materials and the molding dies used when joining the composite materials to each other are the same;
• a step of assembling the molding dies after the composite materials are aligned with the corresponding one of the molding dies and before heating the molding dies to semi-cure the resins of the composite materials;
• a step of releasing a combined state of the molding dies after the resins of the composite materials are semi-cured;
• a step of interposing a reinforcing member between the composite materials facing each other when the molding dies are combined to join the composite materials to each other, the reinforcing member including a third composite material formed into a predetermined shape with a resin impregnated in fibers in a semi-cured state or a completely cured state;
• a step of reassembling the molding dies before joining the composite materials and the reinforcing member;
• and
• a step of joining the composite materials and the reinforcing member to each other when the molding dies are heated to join the first composite material, the second composite material and the third composite materials to each other.