Non-reciprocal circuit element

A non-reciprocal circuit element comprising:

• a substrate having a lower surface and an upper surface, the upper surface having a plurality of wiring patterns formed thereon;
• a magnetic metal layer provided on the lower surface of the substrate;
• a magnetic rotator provided on the upper surface of the substrate, the magnetic rotator including a ferrite core and a laminated structure body in which a plurality of center conductors and a plurality of insulating layers are alternately laminated, and
• a permanent magnet for applying a magnetic field to the magnetic rotator,
• wherein the magnetic metal layer includes a lower yoke provided at a position overlapping the magnetic rotator in a plan view and a plurality of terminal electrodes connected to the magnetic rotator,
• wherein the substrate has a through hole formed at a position overlapping the lower yoke,
• wherein the ferrite core is inserted into the through hole so as to overlap the lower yoke,
• wherein the laminated structure body has, on one surface thereof, a plurality of connection patterns connected to the plurality of center conductors, and
• wherein the laminated structure body is mounted on the upper surface of the substrate such that the laminated structure body covers the through hole and such that the plurality of connection patterns and the plurality of wiring patterns are mutually connected.