An ignition coil for internal combustion engines including a primary core formed in a shape of rectangular ring and fixed on the inner peripheral edge of the bottom wall of a casing, a secondary core having a main portion of which is formed in a shape of straight beam, a primary winding assembly having {HEAD ~ a primary bobbin} formed on {TAIL ~ the main portion} of the secondary core, and a secondary winding assembly 
An ignition coil for internal combustion engines including a primary core formed in a shape of rectangular ring and fixed on the inner peripheral edge of the bottom wall of a casing , a secondary core having a main portion of which is formed in a shape of straight beam , a primary winding assembly having { HEAD ~ a primary bobbin } formed on { TAIL ~ the main portion } of the secondary core , and a secondary winding assembly
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