To obtain a non-reversible circuit element that prevents deterioration in characteristics due to the deviation of the center frequency of a pas band to a low-frequency side caused by the decrease in the strength of a magnetic pole due to the heat history of a permanent magnet, and at the same time, is composed of minimum number of required parts.

In a resin case 1 having a leading terminal 9, a center conductor 5 electrically continuous to the leading terminal 9, a ferrite core 4 that approaches the center conductor 5, a resistor 8 that is connected to the center conductor 5, and a capacitor 7, are provided. In a metal case comprising upper and lower yokes 2 and 3, the permanent magnet 6 for applying a static magnetic field to the ferrite core 4 is arranged. In the permanent magnet 6, the strength of the magnetic pole is set, so that the center frequency is shifted toward the high-frequency side by a specific quantity in advance prior to heating.