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, {HEAD ~ a secondary core} having {TAIL ~ a main portion} of which is formed in a shape of straight beam, a primary winding assembly having a primary bobbin formed on the main portion of the secondary core, and a secondary winding assembly 
having
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 , { HEAD ~ a secondary core } having { TAIL ~ a main portion } of which is formed in a shape of straight beam , a primary winding assembly having a primary bobbin formed on the main portion of the secondary core , and a secondary winding assembly
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