An ignition coil for internal combustion engines is provided which includes a primary and a secondary coils magnetically coupled with each other, a case, a resistor, and a resinous filler. The case includes a case body in which the primary and secondary coils are disposed and a tubular high-voltage tower extending from the case body toward a head of the ignition coil. The resistor 3 is press-fitted into the high-voltage tower and electrically connected to the secondary coil. The resinous filler is packed in the case body to hermetically seal the primary coil and the secondary coil. The resistor includes a resinous coating which covers an outer circumference of the resistor and is press-fit in the high-voltage tower through the resinous coating. This facilitates hermetically sealing a gap between the resistor body and the case and ensures the stability of the sealing.

The present invention relates to a portable work machine including an engine placed in an internal space of an engine case, an ignition coil for igniting the engine provided closer to the engine, and a high voltage cord routed to connect the ignition coil to an ignition plug of the engine. The portable work machine includes a passage portion for housing and guiding the high voltage cord on a route from an area in which the ignition coil is placed to an area in which the ignition plug is placed, in which the passage portion is arranged on an upper face side of the engine case.