Reactor

A reactor, comprising:

• a coil including a winding portion;
• a magnetic core including an inner core portion disposed inside the winding portion and an outer core portion disposed outside the winding portion;
• and
• a resin mold portion that covers at least a portion of an outer circumferential surface of the outer core portion, wherein
• the outer core portion includes:
• a resin core portion made of a composite material including a soft magnetic powder and a resin;
• and
• a first through-hole having a peripheral side completely bound by the outer core portion and extending through the resin core portion, and
• a first end and a second end of the first through-hole open to a surface of the outer core portion other than a coil-facing surface that faces the coil, and the resin mold portion is inserted inside the first through-hole so as to be completely bound by the outer core portion;
• and
• a joining surface where the inner core portion and the outer core portion join together, wherein
• the inner core portion is made of a composite material including a soft magnetic powder and a resin, and includes a second through-hole that extends in a direction orthogonal to an axial direction of the winding portion through a portion of the inner core portion on the joining surface side,
• the magnetic core includes a flow path groove for connecting an opening of the first through-hole and an opening of the second through-hole, and
• the resin mold portion is inserted in the second through-hole via the flow path groove.