It is an object of the invention to provide a reliable ignition by a spark plug in a combustion power tool. Representative combustion power tool may comprise a combustion chamber, a gas supply section, a single spark plug, an ignition control device, a cylinder connected to the combustion chamber, a piston member and a tool member. The ignition control device includes a plurality of ignition circuits connected to the single spark plug to independently input power to the spark plug, and a control section that controls the manner of power input in each of the ignition circuits. According to such construction, power input in each of the ignition circuits can be controlled and therefore, a desired power output at the single spark plug can be realized.