An armrest according to one embodiment of the present invention includes a case including a passage which guides a flow of air while the air is introduced and discharged and a through-hole which is formed via the passage to allow the air to be discharged outward, a fan located inside the case and by which the air is introduced and discharged through the passage, a heating element configured to supply heat to the air discharged by the fan and an outer surface of the case, and a supporter configured to support an external force applied to the case in at least two directions to keep a shape of the case.