Patent ID: 7777604

Claim:
An ignition coil, comprising: a coil case; a coil assembly housed in said coil case; and a casting material filled into a gap between said coil case and said coil assembly and gaps of said coil assembly, wherein said coil assembly has a coil pair including a cylindrical primary coil and a secondary coil disposed concentrically with the primary coil and a core that is fitted into a central space of the coil pair and forms a magnetic path, the core has a primary mold resin coating, which covers a surface of the core and is not made of said casting material, and a secondary mold resin coating, which covers the primary mold resin coating and is not made of said casting material, and concave portions of pin marks formed on the primary mold resin coating by removal of core fixing pins when the primary mold resin coating is formed are filled with the secondary mold resin coating.