A combustor comprising: a plurality of fueling nozzles that jet a fuel; and an air blowhole plate with a plurality of air blowhole groups each including a plurality of air blowholes arranged along each of a plurality of circles to supply to a combustion chamber the fuel and air jetted from each of the fueling nozzles , the circles being each formed so as to share the same center, and the air blowholes being each provided with a swirling angle (θ) to form a swirling flow that rotates around the center in association with each of the air blowhole groups; wherein a first center is surrounded with a plurality of second centers; characterized in that a swirling flow formed by a first air blowhole group disposed along the circles having the first center, and a swirling flow formed by a second air blowhole group arranged along the circles having one of the second centers will rotate in directions opposite to each other; wherein the second air blowhole group includes a plurality of outer circumferential burners each of which having an interference avoidance section in which no air blowhole (21-3) is provided, the interference avoidance section being disposed in an outermost circumferential region of the outer circumferential burner and referring to a range, in the direction opposite to the swirling direction of the second air blowhole group, from a position in which a mixture jetting from air blowholes (21-3) in one outer circumferential burner first reaches a combustor wall, to a position at which the mixture jetting from the air blowholes starts to interfere with a mixture jetting from an adjacent burner. a plurality of fueling nozzles that jet a fuel; and an air blowhole plate with a plurality of air blowhole groups each including a plurality of air blowholes arranged along each of a plurality of circles to supply to a combustion chamber the fuel and air jetted from each of the fueling nozzles , the circles being each formed so as to share the same center, and the air blowholes being each provided with a swirling angle (θ) to form a swirling flow that rotates around the center in association with each of the air blowhole groups; wherein a first center is surrounded with a plurality of second centers; characterized in that a swirling flow formed by a first air blowhole group disposed along the circles having the first center, and a swirling flow formed by a second air blowhole group arranged along the circles having one of the second centers will rotate in directions opposite to each other; wherein the second air blowhole group includes a plurality of outer circumferential burners each of which having an interference avoidance section in which no air blowhole (21-3) is provided, the interference avoidance section being disposed in an outermost circumferential region of the outer circumferential burner and referring to a range, in the direction opposite to the swirling direction of the second air blowhole group, from a position in which a mixture jetting from air blowholes (21-3) in one outer circumferential burner first reaches a combustor wall, to a position at which the mixture jetting from the air blowholes starts to interfere with a mixture jetting from an adjacent burner. <EOS>