CORE PIECE AND REACTOR

摘要

Provided are a core piece that has excellent resin-bonding properties and manufacturability, and a reactor. The core piece constitutes a magnetic core arranged inside and outside a coil made by winding a wire. A region to which a resin part is bonded is provided on at least part of the outer periphery of the core piece, said region comprising recesses and protrusions surrounding the recesses. The recesses are provided with an opening and a flat bottom having a shape similar to that of the opening. The reactor is provided with: a coil made by winding a wire; a magnetic core comprising a plurality of core pieces including a core piece with said recesses and said protrusions; and a resin part at least bonded to the region provided with said recesses and said protrusions, on the periphery of the plurality of core pieces.