Anti-icing system and aircraft

An anti-icing system that blows heated gas to an inner surface of a wing of an aircraft, the anti-icing system comprising:

• a piccolo tube that includes a flow path through which the heated gas flows in a longitudinal direction from a rear end to a front end, and a plurality of ejection holes provided along the longitudinal direction to make the flow path communicate with an outside;
• and
• a supply source that supplies the heated gas toward the piccolo tube, wherein
• the plurality of ejection holes of the piccolo tube are straightly arranged in a first ejection hole line and a second ejection hole line, the first ejection hole line being disposed on a relatively upper side, and the second ejection hole line being disposed on a lower side of the first ejection hole line,
• the piccolo tube includes a damper that adjusts a flow amount Q1 of the heated gas ejected from the first ejection hole line, and a flow amount Q2 of the heated gas ejected from the second ejection hole line, and
• the damper increases and decreases the flow amount Q2 inversely to increase and decrease of the flow amount Q1.