The embodiment of the invention provides a functional garment. The functional garment includes: a garment including a plurality of air accommodating portions formed between a first fabric and a second fabric disposed facing each other and accommodating air inside; and an air
injection device which is connected to at least one of the air accommodating parts and injects air into the air accommodating parts. At least one first region formed on the periphery of the air-containing part, in which the first fabric and the second fabric are joined to divide the air-containing part from another adjacent air-containing part, and air-connecting the air-containing part from another adjacent air-containing part without joining the first fabric and the second fabric and at least one second region through which air can be delivered to the plurality of air accommodating parts when the air is injected into the garment by the air
injection device.