REACTOR

A reactor 2 disclosed by the present specification is equipped with two coils 3 that are arranged parallel to each other, a resin cover 41 that adheres to the two coils to cover the coils, and a column member 13. The resin cover 41 exposes lateral faces of the coils on such a side as to be in contact with a common tangential plane KL. The column member 13 is arranged parallel to the coils 3 in a space that is surrounded by the common tangential plane KL and the lateral faces of the respective coils 3. The column member 13 is exposed on a side thereof that is opposed to the common tangential plane KL, and is in contact with the respective coils 3 on the other side thereof. Furthermore, the column member 13 has a groove 13a that has an opening on the other side of the common tangential plane KL and extends along coil axes. The groove has a width that is narrow at the opening and widens toward a bottom of the groove. An interior of the groove is filled with resin of the resin cover 41.