Abstract: A manufacturing method of producing a non-reciprocal circuit device, which is much smaller than a conventional counterpart, with excellent mass productivity. A support substrate having support portions arranged therein in a lattice-like form is produced, and a previously manufactured gyromagnetic component is bonded on each of the support portions. Then, a permanent magnet plate is bonded. The permanent magnet plate has a plane area which covers all the gyromagnetic components. Subsequently, the entire structure is cut in accordance with each gyromagnetic component.

Abstract: There is provided a manufacturing method of producing a non-reciprocal circuit device, which is much smaller than a conventional counterpart, with excellent mass productivity. A support substrate 400 having support portions Q11 to Qnm arranged therein in a lattice-like form is produced, and a previously manufactured gyromagnetic component 1 is bonded on each of the support portion Q11 to Qnm. Then, a permanent magnet plate 200 is bonded. The permanent magnet plate 200 has a plane area which covers all the gyromagnetic components 1. Subsequently, the entire structure is cut along lines X1-X1 and lines Y1-Y1 in accordance with each gyromagnetic component 1.

Abstract: There are provided a gyromagnetic component and a non-reciprocal circuit device having excellent high-frequency characteristics. A ferrite substrate 12 and a center electrode 11 are included. At least a part of the ferrite substrate 12 is covered with an insulating film 114. A second central conductor 112 constituting the center electrode 11 is caused to adhere to a surface of an insulating film 12. A non-reciprocal circuit device is configured to incorporate this gyromagnetic component therein.