COIL DEVICE

To provide a coil device which has excellent heat dissipation while allowing a reduction in a height and a size.SOLUTION: A coil device 10 has a bobbin 20. The bobbin 20 has: a first cylinder 21 around which a wire 40 is wound; a second cylinder 22 around which the wire 40 or another wire 40, different from the wire 40 mentioned above, is wound; and a coupling part 23 which couples the first cylinder 21 to the second cylinder 22. The bobbin has cores fitted thereto. The cores include: a first core 51 which has a first middle leg 512 inserted along an X-axis into the first cylinder 22; a second core 52 which has a second middle leg 522 inserted along the X-axis into the second cylinder 22 from an opposite side to the first middle leg 512; and an intermediate core 53 having at least two split pieces 53a and 53b which are inserted into the coupling part 23 from a direction substantially perpendicular to the X-axis and are assembled together to form a tabular shape.SELECTED DRAWING: Figure 4 【課題】低背化および小型化が可能でありながら、放熱性に優れたコイル装置を提供すること。【解決手段】コイル装置１０は、ボビン２０を有する。ボビン２０は、ワイヤ４０が巻回される第１筒２１と、ワイヤ４０またはワイヤ４０とは別のワイヤ４０が巻回される第２筒２２と、第１筒２１と第２筒２２とを連結する連結部２３とを持つボビン２０を有する。ボビンには、コアが取り付けられる。コアは、第１筒２２の内部にＸ軸に沿って挿入される第１中脚５１２を有する第１コア５１と、第２筒２２の内部にＸ軸に沿って第１中脚５１２と反対側から挿入される第２中脚５２２を有する第２コア５２と、少なくとも二つの分割片５３ａ，５３ｂを有し、連結部２３にＸ軸と略垂直な方向から挿入され、組み合わされて板状となる中間コア５３と、を有する。【選択図】図４