An engine having a plastic head cover, wherein a cylinder head of the engine is covered by a plastic head cover; a respective spark plug mounted in said cylinder head is connected directly to an individual ignition type ignition coil which is prepared for each of said spark plug; said individual ignition type ignition coil comprises a coil portion in which a center core, a secondary coil wound on a secondary bobbin and a primary coil wound on a primary bobbin are installed concentrically inside a thin narrow cylindrical shape coil case and a circuit case having a connector which is provided at an upper portion of said coil case and has an ignition circuit unit inside; said coil portion is penetrated through said plastic head cover and the center of gravity of said ignition coil is positioned at a lower position from said plastic head cover; and said circuit case having said connector is fixed to an outer face of said plastic head cover.