An object of the present invention is to introduce the mixer into the combustion chamber through the spark plug to facilitate the stratification of the air-fuel ratio distribution around the electrode and to form a strong vortex by air flow to increase the combustion efficiency of the mixer around the electrode of the spark plug. It is to provide a secondary injector of the mixer for improving the flow characteristics.;The present invention for achieving the above object;A spark plug fastened to a cylinder head to ignite the mixer of an engine,;A mixer supply passage formed between the center electrode of the spark plug and the housing to introduce the mixer into the combustion chamber;;A mixer storage tank connected to the surge tank;;An air pump feeding air to the spark plug;;A solenoid valve provided in the middle of a connecting pipe connecting the mixer storage tank and the mixer supply passage to open the connecting pipe immediately before the spark time and to supply the mixer; And;And an electronic controller for controlling the opening and closing time of the solenoid valve.
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