A combustor comprising a nozzle casing and a plurality of first fuel nozzles (HL1∼HL3) disposed in the nozzle casing and spaced apart from each other along an annular imaginary line, each first fuel nozzle (HL1∼HL3) having an axial center at which a first center line is drawn and comprising: a first fuel injection passage disposed at the axial center of the first fuel nozzle and configured to inject liquid fuel into a combustion chamber; a second fuel injection passage enclosing the first fuel injection passage, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the first center line; and a first air injection passage enclosing the second fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the second fuel injection passage; characterized in that the combustor further comprises: a plurality of second fuel nozzles (LL1∼LL3) disposed along the annular imaginary line, each second fuel nozzle (LL1∼LL3) being disposed between a pair of adjacent first fuel nozzles (HL1∼HL3) of the plurality of first fuel nozzles (HL1∼HL3) and having an axial center at which a second center line is drawn; and wherein each of the plurality of second fuel nozzles (LL1∼LL3) comprises: a central shaft disposed at the axial center of the second fuel nozzle; a third fuel injection passage enclosing the central shaft, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the second center line; and a second air injection passage enclosing the third fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the third fuel injection passage. a first fuel injection passage disposed at the axial center of the first fuel nozzle and configured to inject liquid fuel into a combustion chamber; a second fuel injection passage enclosing the first fuel injection passage, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the first center line; and a first air injection passage enclosing the second fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the second fuel injection passage; characterized in that the combustor further comprises: a plurality of second fuel nozzles (LL1∼LL3) disposed along the annular imaginary line, each second fuel nozzle (LL1∼LL3) being disposed between a pair of adjacent first fuel nozzles (HL1∼HL3) of the plurality of first fuel nozzles (HL1∼HL3) and having an axial center at which a second center line is drawn; and wherein each of the plurality of second fuel nozzles (LL1∼LL3) comprises: a central shaft disposed at the axial center of the second fuel nozzle; a third fuel injection passage enclosing the central shaft, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the second center line; and a second air injection passage enclosing the third fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the third fuel injection passage. a plurality of second fuel nozzles (LL1∼LL3) disposed along the annular imaginary line, each second fuel nozzle (LL1∼LL3) being disposed between a pair of adjacent first fuel nozzles (HL1∼HL3) of the plurality of first fuel nozzles (HL1∼HL3) and having an axial center at which a second center line is drawn; and wherein each of the plurality of second fuel nozzles (LL1∼LL3) comprises: a central shaft disposed at the axial center of the second fuel nozzle; a third fuel injection passage enclosing the central shaft, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the second center line; and a second air injection passage enclosing the third fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the third fuel injection passage. a central shaft disposed at the axial center of the second fuel nozzle; a third fuel injection passage enclosing the central shaft, and configured to inject liquid fuel into the combustion chamber at a predetermined spray angle with respect to the second center line; and a second air injection passage enclosing the third fuel injection passage, and configured to inject air to be mixed with the injected liquid fuel from the third fuel injection passage.