Internal-combustion-engine ignition coil apparatus

An internal-combustion-engine ignition coil apparatus that supplies an ignition plug mounted in an internal combustion engine with a voltage for producing a spark discharge, the internal-combustion-engine ignition coil apparatus comprising:

• a primary coil;
• a secondary coil disposed in such a way as to surround an outer circumferential portion of the primary coil;
• an iron core that makes the primary coil and the secondary coil magnetically couple with each other;
• a case that contains the primary coil, the secondary coil, and the iron core;
• a connector assembly in which a connector and an igniter are integrally fixed to each other;
• and
• a heat sink that cools the igniter,
• wherein the connector assembly is assembled to the case,
• wherein the igniter is contained in the case,
• wherein the case has an opening window that opens in a wall face portion thereof facing a surface portion of the igniter,
• wherein the heat sink is inserted into the case through the opening window and is bonded not only to the surface portion of the igniter with a first adhesive but also to the inner circumferential surface of the opening window with a second adhesive, and the heat sink has an exposed portion that is exposed to the outside of the case through the opening window, and
• wherein a potting resin is filled into the case.