AIR CONDITIONER FOR VEHICLE

Provided is an air-conditioning apparatus for a vehicle including a main frame capable of being assembled without increasing the number of parts and the number of processes. An air-conditioning apparatus for a vehicle includes a casing divided into an indoor chamber and an outdoor chamber by a partition plate (12), the casing including a cover (15) placed on a top thereof, and a refrigeration cycle device placed across the indoor chamber and the outdoor chamber in the casing. Each of side plates (14), serving as side surfaces of the indoor chamber and the outdoor chamber, of the casing is extruded in one piece of aluminum.