Coil unit, and power transmitting device, power receiving device and wireless power transmission system using the coil unit

The coil unit 10 includes a coil 11 formed by spirally winding a conductive wire, a capacitor 12 electrically connected to the coil 11, a magnetic member 13 disposed on the opposite side of the opposite surface of the coil 11, that is, the back side of the coil 11; a first metal shield 14 disposed on the back side of the magnetic member 13; a second metal shield 16 disposed between the magnetic member 13 and the first metal shield and forming the storage space of the capacitor 12. The second metal shield 16 includes a flat plate portion 16a opposed to a surface of the magnetic body 13 oppositeto the opposite surface of the coil 11; and a side wall 16b disposed in the capacitor 12 and a flange portion 16c bent toward a front end portion of the side wall of the first metal shield, and the flange portion (16c) is configured to be thermally connected to the first metal shield (14). 本发明提供种将在线圈单元中产生的热有效地散热的线圈单元。线圈单元(10)具备：线圈(11)，导线被螺旋状地卷绕；电容器(12)，其与线圈(11)的线圈轴向的端侧的线圈(11)电连接；磁性体(13)，其配置于与线圈(11)的相对面的相反侧即线圈(11)的背面侧；第金属