Provided is a fusion device (100) comprising: an inductive coil (10) in which a first composite material (200) and a second composite material (300), which each contain conductive reinforcement fibers and thermoplastic resin, are fused, and which generates a current in the reinforcement fibers arranged to be close to the first composite material (200) and included in the first composite material (200) to heat the first reinforcement material (200), and generates a current in the reinforcement fibers included in the second composite material (300) to heat the second composite material (300); a housing (30) that has a pressure surface (31) disposed between the inductive coil (10) and the first composite material (200) while contacting the first composite material (200); and a cooling unit (20) that cools the pressure surface (31).
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