Air conditioner for vehicle

An air conditioner for a vehicle which comprises:

• an air-conditioning case defining an inner face and including an air inflow port formed at one side and a plurality of air outflow ports formed at the other side for discharging air introduced thereinto;
• a door including a door member which is slidably mounted on the inner face of the air-conditioning case, said door member having a first side facing the air-conditioning case and extending between a pair of end portions;
• a gear shaft which is rotatably mounted inside the air-conditioning case to operate the door member and interlocks with the door member;
• the door member defining a plurality of gear grooves formed in a sliding direction of the door member adjacent to the end portions to interlock with the gear shaft;
• a sealing member attached to the first side of the door member and covering substantially an entirety of the first side of the door member except for an area adjacent the gear grooves, to be sealingly face-contacted with the inner face of the air-conditioning case by wind pressure inside the air-conditioning case in order to prevent vibration of the door member and air leakage at the face-sealed portion;
• and
• at least one rib protruding from the first side of the door member in the area which the sealing member is omitted to prevent excessive pressure of the sealing member by wind pressure inside the air-conditioning case;
• wherein a height of the rib is equal to or smaller than a height of the sealing member.