PURPOSE: To feed a fuel directly to each cylinder of two-cycle internal combustion engine without using a complicator mechanism.

CONSTITUTION: Mixing chambers 22b, fuel injectors 22d for injecting a fuel into the mixing chambers, and injection valves 22e which are opened when the pressure in the mixing chambers reach no less than a set value to communicate the inside of the mixing chambers to the inside of the cylinders of an engine, are provided for a multi-cylinder two-cycle internal combustion engine. A gas extraction port 24 for extracting the high pressure gas generated in each cylinder is provided on each cylinder, and the gas extracted from the gas extraction port 24 of the other cylinder is guided into the mixing chamber 22b provided on each cylinder.