Patent ID: 7129812

Claim:
A stick-shaped ignition coil comprising: a secondary coil that includes a secondary spool and a secondary winding, the secondary winding wound around the secondary spool; a primary coil that includes a primary spool and a primary winding, the primary winding wound around the primary spool, wherein the secondary coil and the primary coil are substantially coaxially arranged; a plurality of annular protrusions that are integrally formed on an outer circumferential periphery of an upper end portion of one of the primary coil and the secondary coil that is arranged on an outer circumferential side with respect to the other of the primary coil and the secondary coil, said plurality of annular protrusions being disposed above an upper end of the winding of said one of the primary coil and secondary coil; and a case that is press-inserted to an outer circumferential periphery of the plurality of annular protrusions.