To easily and properly manufacture a coil with a minimum number of components.

A coil R has a structure where two or more independent windings 1, etc., are disposed in parallel so that the winding centers lie on nearly the same line and magnets 4 are disposed outside the windings 1 located on both ends. The coil R contains a bobbin 2, which has a cylindrical section 20 with both ends opened and has separated winding sections 20a for winding the windings 1, 1, etc., on the outer surface of the cylindrical section 20 and a bar-like magnetic core 3 inserted into the cylindrical section 20 of the bobbin 2. Outside both end of the cylindrical section 20 of the bobbin 2, magnet holding walls 21 are formed which are separated from both end of the cylindrical section 20 by a gap 21a for allowing magnets 4 to be fitted.