a fuel feed apparatus of an internal combustion engine is provided having a fuel passage serving to guide fuel in a predetermined direction , and an assist air passage serving to collide assist air against the fuel . the apparatus includes an inner member formed therein with the fuel passage extending from one end surface to another end surface thereof . an outer member is provided in surrounding relation to the inner member and forms the assist air passage between the inner member and the outer member . the outer member has at least one penetrating hole penetrating therethrough defining an inlet opening of the assist air passage . the air passage extends from the penetrating hole in a direction along fuel injection and has an outlet opening opened to an outlet side of the fuel passage . the outer member is joined to the inner member at an outer periphery of the one end surface of the inner member .