A fuel injection control device provided with: a standard fuel injection timing setting unit 41 which previously sets a standard fuel injection timing with respect to engine speed and fuel injection quantity; an injection penetration judging unit 45 which judges whether or not the penetration of the fuel atomization in a cylinder is in an increasing condition, by use of at least one out of a detected ambient pressure from an ambient pressure sensor, an estimated cylinder pressure at an injection start timing, and an estimated ignition delay from an injection start timing to a combustion start timing; and a fuel injection timing correction unit 43 which corrects the fuel injection timing toward an advanced timing angle and constrains the penetration of the fuel atomization, in a case where the penetration judging unit judges that the penetration of the fuel atomization is in an increasing condition.