Abstract: The present disclosure provides a common mode noise filter that can improve attenuation characteristics of common mode noise over a wide frequency range. The common mode noise filter of the present disclosure includes: two magnetic sections and each of which is made of a magnetic material; and non-magnetic section disposed between magnetic sections in a stacking direction, non-magnetic section being made of a non-magnetic material. Moreover, the common mode noise filter further includes two coils and metal layer. Coils are disposed inside non-magnetic section while facing each other. Metal layer is formed inside at least one of two magnetic sections while being connected to the ground. Metal layers are positioned closer to a lower surface of magnetic section than an upper surface of magnetic section and closer to an upper surface of magnetic section than a lower surface of magnetic section.

Abstract: In a common mode noise filter, first coil (12) includes first coil conductor (16) and second coil conductor (17) with spiral shapes. Second coil (13) includes third coil conductor (18) and fourth coil conductor (19) with spiral shapes. First coil conductor (16), third coil conductor (18), second coil conductor (17), and fourth coil conductor (19) are placed in this order from above. First metal layer (14) configured to be connected to a ground is provided above first coil conductor (16).

Abstract: In a common mode noise filter, first coil (12) includes first coil conductor (16) and second coil conductor (17) with spiral shapes. Second coil (13) includes third coil conductor (18) and fourth coil conductor (19) with spiral shapes. First coil conductor (16), third coil conductor (18), second coil conductor (17), and fourth coil conductor (19) are placed in this order from above. First metal layer (14) configured to be connected to a ground is provided above first coil conductor (16).