PURPOSE: To increase the performance of superconduction magnet, by increasing the thermal and mechanical performance of the fixing agent, through the immersion of fixing agent under reduced pressure, by inserting fibrous material between the layers of superconduction wires.

CONSTITUTION: The superconduction wire 20 is wound on the bobbin frame 10, by inserting the organic or inorganic fibrous material 30 between layers, and the uppermost layer constitutes a seal package together with the flanges 11, 12 by seal with the mold frame 40. The flanges 11, 12 are provided with the holes 13, 14 and the liquid fixing agent A is absorbed 14 by the vacuum vent 13. It is most suitable to the thermosetting resin as the fixing agent. With this constitution, since winding is made via fibrous material, the fibrous material is tightened and it can increase the containing rate of fiber with a given thickness. Since the fibrous material can be entered to the clearance between the layers and the wires, the coil is strong in mechanically and excellent thermally, and the boil containing rate is very small, allowing to stable the quality.