Ignition coil and ignition device

An ignition coil for use in an internal combustion engine, comprising:

• a first primary coil including a first primary winding, in which a direct-current voltage is applied to a first end and a second end is connected to a ground point;
• a first secondary coil including a first secondary winding;
• a first iron core that passes through an inside of the first primary coil and an inside of the first secondary coil and is configured to electromagnetically couple the first primary coil and the first secondary coil;
• a second primary coil including a second primary winding, in which the direct-current voltage is applied to a first end and a second end is connected to the ground point;
• a second secondary coil including a second secondary winding;
• and
• a second iron core that passes through an inside of the second primary coil and an inside of the second secondary coil and is configured to electromagnetically couple the second primary coil and the second secondary coil, wherein
• one end of the first iron core and one end of the second iron core are connected to each other, and the other end of the first iron core and the other end of the second iron core are connected to each other, to form a closed magnetic circuit,
• a magnetic flux directed from the other end to the one end is generated in the first iron core when the direct-current voltage is applied to the first primary coil, and
• a magnetic flux directed from the other end to the one end is generated in the second iron core when the direct-current voltage is applied to the second primary coil.