Air-conditioning apparatus for vehicle comprising an air-conditioning case with an inlet portion and a discharge port, and a first partition wall partitioning the inner space thereof into a first space portion and a second space portion; a cooling heat exchanger arranged in the air-conditioning case through the first space portion and the second space portion, and connected to the inlet portion; and a heating heat exchanger arranged in the air-conditioning case through the first space portion and the second space portion, wherein the air-conditioning case comprises a second partition wall which partitions the second space portion into a plurality of space portions, and a first door which is arranged in a third space portion from among the plurality of space portions and disposed behind the heating heat exchanger. The first door adjusts the opening degree of the heating heat exchanger in the third space portion.