Abstract: In order to suppress engine stall and rotation fluctuation after an engine is started in an internal combustion engine capable of using an alcohol-containing fuel, a PCM (50) performs a correction operation of increasing a fuel injection quantity from an initial fuel injection quantity after the engine is started to a fuel injection quantity set when an alcohol concentration of a fuel is regarded as a maximum value or a value close to the maximum value within a predetermined range when a variation of an engine speed is greater than or equal to a threshold during an idle operation after the engine is started, and performs a correction operation of decreasing the increased fuel injection quantity until the variation of the engine speed becomes less than the threshold when the variation is greater than or equal to the threshold after the fuel injection quantity is corrected to increase.