An inductor comprising: a magnetic core; and a conductor member, the conductor member being configured with: an insertion part that is inserted into the magnetic core; a first outer surface arrangement part that is connected to one end of the insertion part and that is arranged along a first outer surface of the magnetic core; a second outer surface arrangement part that is connected to the other end of the insertion part and that is arranged along a second outer surface of the magnetic core; a first terminal part that is connected to the first outer surface arrangement part; and a second terminal part that is connected to the second outer surface arrangement part, characterized in that the insertion part includes an insertion first sub part and an insertion second sub part which are I-shaped and extend through a groove linearly extending through the magnetic core, the insertion second sub part is stacked on the insertion first sub part, the sum of a thickness of the insertion first sub part and a thickness of the insertion second sub part is larger than a thickness of the first outer surface arrangement part and larger than a thickness of the second outer surface arrangement part, and a width of the insertion first sub part and a width of the insertion second sub part are smaller than a width of the first outer surface arrangement part and a width of the second outer surface arrangement part. a magnetic core; and a conductor member, the conductor member being configured with: an insertion part that is inserted into the magnetic core; a first outer surface arrangement part that is connected to one end of the insertion part and that is arranged along a first outer surface of the magnetic core; a second outer surface arrangement part that is connected to the other end of the insertion part and that is arranged along a second outer surface of the magnetic core; a first terminal part that is connected to the first outer surface arrangement part; and a second terminal part that is connected to the second outer surface arrangement part, characterized in that the insertion part includes an insertion first sub part and an insertion second sub part which are I-shaped and extend through a groove linearly extending through the magnetic core, the insertion second sub part is stacked on the insertion first sub part, the sum of a thickness of the insertion first sub part and a thickness of the insertion second sub part is larger than a thickness of the first outer surface arrangement part and larger than a thickness of the second outer surface arrangement part, and a width of the insertion first sub part and a width of the insertion second sub part are smaller than a width of the first outer surface arrangement part and a width of the second outer surface arrangement part. an insertion part that is inserted into the magnetic core; a first outer surface arrangement part that is connected to one end of the insertion part and that is arranged along a first outer surface of the magnetic core; a second outer surface arrangement part that is connected to the other end of the insertion part and that is arranged along a second outer surface of the magnetic core; a first terminal part that is connected to the first outer surface arrangement part; and a second terminal part that is connected to the second outer surface arrangement part, characterized in that the insertion part includes an insertion first sub part and an insertion second sub part which are I-shaped and extend through a groove linearly extending through the magnetic core, the insertion second sub part is stacked on the insertion first sub part, the sum of a thickness of the insertion first sub part and a thickness of the insertion second sub part is larger than a thickness of the first outer surface arrangement part and larger than a thickness of the second outer surface arrangement part, and a width of the insertion first sub part and a width of the insertion second sub part are smaller than a width of the first outer surface arrangement part and a width of the second outer surface arrangement part.