Patent ID: 6946943

Claim:
A stick-shaped ignition coil that is received in a plughole formed in a cylinder head of an internal combustion engine, the stick-shaped ignition coil comprising: a coil portion that includes: 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 and a secondary winding, the secondary winding 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, the primary winding 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, the outer core arranged on an outermost side of the coil portion in a radial direction of the coil portion, the outer core having a middle portion that is located at a center of the outer core in an axial direction of the outer core; a first portion that is connected to an upper end portion of the coil portion, the first portion apart from the middle portion of the outer core in the axial direction of the outer core; and at least one first positioning portion that is formed on the first portion, wherein the at least one first positioning portion is in proximity to an inner circumferential periphery of a first hole portion, which is formed in the plughole, in the radial direction of the plughole.