Abstract: An ignition coil apparatus for an internal combustion engine can improve the ignition performance of the engine in an entire rotation range. The ignition coil apparatus is arranged in a plug hole formed in the engine, and includes a case (1), a center core (2) arranged on a central axis of the case (1), and a primary coil (3) and a secondary coil (4) both arranged on an outer periphery of the center core (2). Magnets (20) are arranged on the opposite end faces, respectively, of the center core (2) for applying a magnetic force thereto in a direction opposite to the direction of magnetic flux lines generated when a primary current (i1) is supplied to the primary coil (3), and the primary coil (3) has a resistance, an upper limit value of which is 1.2 ?.

Abstract: To provide an ignition device for an internal combustion engine which for example prevents a crack from being made in a cast insulating resin or a transformer output voltage control element from being damaged.

Abstract: To provide an ignition device for an internal combustion engine which for example prevents a crack from being made in a cast insulating resin or a transformer output voltage control element from being damaged.