A flowable insulating resin 1 is placed in a sheet-like molding die space
and conductive magnetic particles 2 are dispersed in the insulating resin
1. A first magnetic field G1 is acted in the sheet thickness direction on
the position where a conductive path is to be formed in the die space,
and conductive magnetic particles 2a are locally collected together to
form a conductive path. Simultaneously, a second magnetic field G2 is
acted in the sheet thickness direction on the intermediate region and the
magnetic field G2 is moved in the lateral direction to move conductive
magnetic particles 2b left in the intermediate region to join the
collection forming the conductive path. As a result, the number of the
conductive magnetic particles left in the insulating resin becomes
smaller.