A core for an ignition coil comprises a core element formed as a core stack with a plurality of laminations and having a mounting bore with an insulating layer, a connecting element for connecting the core element to a holder and inserted in the mounting bore, and elements for establishing an earth contact between the core element and the connecting element and including a projection formed by at least one of the laminations of the core stack formed so that the projection extends into the mounting bore and when the connecting element is inserted into the mounting bore it removes the insulating layer from the projection and establishes the earth contact.