Combustion device and gas turbine system

A combustion device comprising:

• a combustion chamber;
• a plurality of hydrogen injection holes facing inside of the combustion chamber, the plurality of hydrogen injection holes included at intervals in a circumferential direction of the combustion chamber;
• a first air injection hole facing the inside of the combustion chamber and extending in the circumferential direction on a radially outer side with respect to the plurality of hydrogen injection holes, the first air injection hole being annular;
• a second air injection hole facing the inside of the combustion chamber and extending in the circumferential direction on a radially inner side with respect to the plurality of hydrogen injection holes, the second air injection hole being annular;
• a first swirling blade provided in the first air injection hole and inclined in the circumferential direction with respect to a combustion-chamber-side axial direction, the combustion-chamber-side axial direction being a part of an axial direction of the combustion chamber, the part facing the combustion chamber;
• and
• a second swirling blade provided in the second air injection hole and inclined to a same side as the first swirling blade in the circumferential direction with respect to the combustion-chamber-side axial direction.