Method of manufacturing reactor

A method of manufacturing a reactor that comprises:

• a ring core including a pair of straight portions extending in parallel;
• a bobbin including a pair of cylinder portions and a pair of connecting portions, each of the pair of cylinder portions having ends and covering the corresponding straight portion, and each of the connecting portions connecting the corresponding ends;
• a pair of coils, each of the coils being wound on the corresponding cylinder portion;
• and
• a plastic cover covering the ring core, the bobbin, and the pair of coils, wherein
• each of the connecting portions includes a first protrusion in contact with an inner circumferential surface of the ring core, and
• a pair of second protrusions is provided on a cavity surface of a mold in which a subassembly of the ring core, the bobbin, and the coils is to be contained and then the plastic cover is to be formed by resin injection, each of the second protrusions is provided at a position facing the corresponding first protrusion across the ring core,
• the method comprising:
• forming the plastic cover by injecting molten resin into the mold while clamping the ring core by the first and second protrusions.