To reduce an amount of HC at cold starting, to improvem of drivability when an engine is cold to avoid engine stall and hesitation.

The invention is characterized in that its device is provided with throttle valve for regulating intake air volume, a bypass air volume regulating valve for regulating bypassing air volume in a bypass passage, an ignition coil capable of performing multiple ignition for causing an ignition plug of the same cylinder to spark at multiple times per one cycle, a bypass air volume control means for controlling the bypass air volume regulating valve so that an engine rotating speed gets at a target engine rotating speed, an ignition timing feedback control means for feedback-controlling the ignition coil so that ignition timing of the ignition plug becomes target ignition timing, and a multiple ignition control means for controlling the ignition coil so as to cause multiple ignition of the ignition plug.