At one or both ends in the longitudinal direction of the primary bobbin, an extended connecting portion extended from the bobbin main portion to the upper surface of the primary core is formed integrally with the bobbin main portion in {HEAD ~ a position} offset relative to {TAIL ~ the bobbin main portion} 
offset relative to
At one or both ends in the longitudinal direction of the primary bobbin , an extended connecting portion extended from the bobbin main portion to the upper surface of the primary core is formed integrally with the bobbin main portion in { HEAD ~ a position } offset relative to { TAIL ~ the bobbin main portion }
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