PURPOSE: To prevent saturation of magnetic cores even if a current is high to some extent or more and to make the entire element compact, by arranging a soft magnetic body between a magnetic core and a magnetic core constituting a magnetic circuit, and constituting the element so that the number of magnetic fluxes passing through the soft magnetic bodies is changed based on the magnitude of a winding current.

CONSTITUTION: A gap material 4 and a soft magnetic material, whose permeability is higher than those of an I-type core 2 and an E-type core 3, are inserted in the connecting parts of the I-type core 2 and the E-type core 3. A winding 5 is wound around the central leg of the E-type core 3. When a current I is made to flow, the number of magnetic fluxes 2 passing the soft magnetic material 1 is few when the winding current I is small. Therefore the inductance value L of a part as an inductance element indicates a large value. When the winding current I becomes large, the number of the magnetic fluxes passing the soft magnetic material 1 is increased to 1. When the value of 1 exceeds the saturated magnetic flux density of the soft magnetic material 1, the soft magnetic material 1 becomes equivalent to non-existence of the material 1 itself. The insuctance value L as the inductance element indicates a small value. Since the inductance value can be changed by the winding current of the inductance element, the element can be made compact.