PURPOSE: To prevent effectively a core and a coil wound on the core from being affected by humidity or the like and to keep inductance of a chip-type coil element always constant, by covering the outer periphery of the core on which the coil is wound with a liquid crystal polymer resin.

CONSTITUTION: A core 1 on which a coil 2 is wound is bonded to a pair of terminal plates 3a and 3b whose bottoms are aligned in a plane with a predetermined distance, by means of an adhesive of epoxy resin or the like. The opposite ends of copper wire covered with polyurethane constituting the coil 2 are brazed to the terminal plates 3a and 3b, respectively, by means of a brazing material such as solder or the like, The outer periphery of the core 1 on which the coil 2 is wound is completely covered with a molded layer 5 of a liquid crystal polymer resin or the like. This covering layer 5 is highly resistive to humidity and protects the coil 2 wound on the core 1 against humidity in the atmosphere or the like. Therefore, the core 1 and the coil 2 are not affected by humidity or the like and the inductance of the chip-type coil element can be kept always constant.