DOOR OF AIR CONDITIONER FOR VEHICLE

The present invention relates to a door of an air conditioner for a vehicle, which can prevent damage and distortion by bending during assembly and reinforce strength due to a plate-shaped sliding door with flexibility. The door of the air conditioner for a vehicle, which is disposed inside an air-conditioning case to adjust the degree of opening of an air passageway, includes: a door body formed in a plate shape and formed to be able to slide in the air-conditioning case; and a reinforcing part formed from at least one side of the door body in a thickness direction and extending in an axial direction, which is perpendicular to a sliding direction of the door body.