PURPOSE: To provide a fuel control device for an internal combustion engine which prevents the internal combustion from stopping after start-up by determining adequate injection quantity at the time of start-up corresponding to a ratio of alcohol content in mixed fuel, and gradually decreasing injection quantity.

CONSTITUTION: A fuel control device for an internal combustion engine 22 having a main injector arranged in each cylinder and a cold injector arranged in an intake manihold while using alcohol mixed fuel as fuel, is provided with a means 208 which detects a ratio of alcohol content in the alcohol mixed fuel and means 209-211 which detect quantity of state representing driving condition in the internal combustion engine. The fuel control device for internal combustion engine 22 is also provided with a means which distinguishes whether the internal combustion engine is in a starting condition or not from the driving condition quantity and a means which determines an initial value of fuel quantity at the time of start-up injected from the main injector 2041-2044 and the cold injector 205 and by which the higher the ratio of alcohol content, the faster the starting time for decreasing fuel quantity at the time of start-up.