To provide a fuel injection control device for a multiple-kind fuel engine configured to change over maps in response to alcohol concentration.

This fuel injection control device used in the multiple-kind fuel engine 1 is configured to include: a memory region 26 which stores a plurality of fuel injection control maps 30 in which a state of the engine 1 and a basic fuel injection time Ti are made to correspond to each other in response to the concentration of alcohol contained in the fuel; a basic fuel injection time determination part 22 which determines the basic fuel injection time Ti using the currently selected fuel injection control map 30 of the concentration of alcohol; a fuel injection quantity determination part 25 which determines a fuel injection quantity based on the basic fuel injection time Ti and an air-fuel ratio correction coefficient KO2; and a map changeover part 21 which selects the fuel injection control map 30 of the concentration of alcohol close to the concentration of alcohol of the fuel based on the air-fuel ratio correction coefficient KO2.