Air conditioning apparatus

An object is to provide an air conditioning apparatus in which, even when a refrigerant leaks outside a casing, the leaked refrigerant is easily guided to the inside of the casing. In an indoor unit (3) of an air conditioning apparatus (1) that includes a casing (30) having an opening (64a), an indoor heat exchanger (51) disposed in the casing (30), a liquid-side connection pipe (53) or a gas-side connection pipe (54) extending from the indoor heat exchanger (51) to the outside of the casing (30) through the opening (64a), and an indoor-side dew condensation prevention member (71) that covers the periphery of the liquid-side connection pipe (53) or the gas-side connection pipe (54), an end portion of the liquid-side connection pipe (53) or the gas-side connection pipe (54) is used in a state of being covered from the periphery thereof by a connection-side dew condensation prevention member (72) or is covered from the periphery thereof by the indoor-side dew condensation prevention member (71), and there is formed a communication passage (91) that causes a space of a part covered by the dew condensation prevention member at the end portion of the liquid-side connection pipe (53) or the gas-side connection pipe (54) to be in communication with the internal space of the casing (30).