To provide a method not only improving atomization of injected fuel but also influencing the flow direction of fuel in relation to engine load.

In relation to the load state of an internal combustion engine, gas flow is made to flow out through at least one lateral opening 25 at high speed during low load and at low speed during partial and full load. In this case, at least one of a plurality of fuel jets a, b is oriented to influence on orientation of the fuel jets a, b so that a plurality of fuel jets a, b extend in one or in proximity to each other during low load and to such an extent that the influence of gas flow on orientation of the fuel jets a, b can be disregarded during partial and full load.