Patent ID: 7132917

Claim:
An ignition coil comprising: a center core; a secondary coil that is arranged on an outer circumferential side of the center core, the secondary coil including: a secondary spool having a high voltage bracket that is arranged on an end portion of the secondary spool, the high voltage bracket including a secondary terminal; and a secondary winding that is wound around the secondary spool; a primary coil that is arranged on an outer circumferential side of the center core, the primary coil including: a primary spool; and a primary winding that is wound around the primary spool, wherein the secondary coil and the primary coil are substantially coaxially arranged; and an outer core that is arranged on an outer circumferential side 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, wherein the secondary terminal includes a first connecting portion, which has a bulb shape, in a tip end thereof, the first connecting portion connects with an end portion of the secondary winding of the secondary coil, the first connecting portion is covered with an electrically insulative resins, the secondary terminal further includes a first portion that connects with the first connecting portion, the first portion arranged on a side of the secondary spool with respect to the first connecting portion, the first connecting portion has a diameter that is greater than a width of a cross section of the first portion, and the diameter of the first connecting portion is greater than a thickness of the cross section of the first portion.