Reactor device

A reactor device comprising:

• a coil;
• a magnetic core having the coil provided thereon;
• a case accommodating the coil and the magnetic core therein, the case having a screw hole and an opening;
• a cooling plate fixed to the case;
• an insulating sheet disposed between the coil and the cooling plate;
• a graphite sheet disposed between the coil and the cooling plate, the graphite sheet being compressible;
• and a screw passing through the screw hole to fix the cooling plate to the case, wherein the coil contacts the insulating sheet through the opening of the case, and the graphite sheet contacts the cooling plate, wherein the graphite sheet has a compressibility equal to or larger than 50% upon having a pressure of 1 MPa applied to the graphite sheet.