Patent ID: 7243643

Claim:
An ignition device for an internal combustion engine comprising: a spark plug having a pair of electrodes for discharging a current therebetween to ignite an air-fuel mixture in a combustion chamber of the internal combustion engine; an ignition coil for supplying the current to the spark plug; and a single-piece housing that encloses both the spark plug and the ignition coil therein such that the electrodes protrude outwardly from the housing, wherein the single-piece housing has a mounting portion configured to be fastened to a mounting hole provided in a cylinder head of the internal combustion engine to locate the electrodes inside the combustion chamber and to locate the ignition coil outside the combustion chamber, and the mounting portion includes: a screw portion configured to be screw-fastened to the mounting hole; and a non-screw portion configured to be tightly fitted to the mounting hole.