Reactor

1. A reactor comprising:

a coil including a pair of winding portions arranged in parallel via a coupling portion;

a magnetic core including inner core portions arranged inside the winding portions and a pair of outer core portions arranged outside the winding portions;

a pair of holding members arranged so as to face end faces of the winding portions; and

a molded resin portion that covers at least a portion of outer peripheral surfaces of the outer core portions and fills spaces between inner peripheral surfaces of the winding portions and the inner core portions,

wherein the coil is constituted by a single continuous winding wire,

the coupling portion is formed by bending back a portion of the winding wire, and

one of the holding members on a side on which the coupling portion is arranged includes a recessed portion that houses the coupling portion and an inward projection that is arranged inside the coupling portion.

2. The reactor according to claim 1 , wherein in plan view of a face of the one holding member on a recessed portion side, a ratio of the area of the inward projection to the area of the recessed portion is greater than or equal to 50%.

3. The reactor according to claim 1 , wherein at a face of the one holding member on a recessed portion side, an end face of the inward projection is flush with a face of a remaining portion of the holding member excluding the recessed portion.

4. The reactor according to claim 1 , wherein the holding member is provided with a pair of through-holes into which end portions of the inner core portions are inserted,

the reactor further comprises inward interposing portions that project from peripheral edge portions of the through-holes toward interiors of the winding portions, and

the inward interposing portions are inserted between the winding portions and the inner core portions.

5. The reactor according to claim 4 , wherein at the peripheral edge portions of the through-holes of the one holding member, the inward interposing portions are provided only on a side where the recessed portion is provided.

6. The reactor according to claim 2 , wherein at a face of the one holding member on a recessed portion side, an end face of the inward projection is flush with a face of a remaining portion of the holding member excluding the recessed portion.

7. The reactor according to claim 2 , wherein the holding member is provided with a pair of through-holes into which end portions of the inner core portions are inserted,

the reactor further comprises inward interposing portions that project from peripheral edge portions of the through-holes toward interiors of the winding portions, and

the inward interposing portions are inserted between the winding portions and the inner core portions.

8. The reactor according to claim 3 , wherein the holding member is provided with a pair of through-holes into which end portions of the inner core portions are inserted,

the reactor further comprises inward interposing portions that project from peripheral edge portions of the through-holes toward interiors of the winding portions, and

the inward interposing portions are inserted between the winding portions and the inner core portions.