A combustor of a gas turbine including fuel distributing and supplying means including a plurality of sets of fuel nozzles arranged circularly on the head of the combustor and each fuel nozzle being provided with a combustion primary air swirler, and a plurality of fuel supply systems each connected to one fuel nozzle or a plurality of fuel nozzles. One set of fuel nozzles is located inside another set of fuel nozzles and projects further inwardly into the interior of the combustor. The number of the fuel supply systems handling a supply of fuel can be increased or reduced depending on the volume of fuel.