Air conditioner

An air conditioner is provided with: a heat exchanger (7) formed from aluminum or an aluminum alloy; a gas pipe connected to the heat exchanger and through which a gas refrigerant passes; and a liquid pipe which is connected to the heat exchanger and through which a liquid refrigerant or a gas-liquid two-phase refrigerant passes. The gas pipe and the liquid pipe each have a first refrigerant pipe (105) formed of aluminum or an aluminum alloy and a second refrigerant pipe (106) formed of copper or a copper alloy, one end of the second refrigerant pipe is connected to the first refrigerant pipe (105) via a connection part (107), and a connection screw part (201) is disposed at the other end of the second refrigerant pipe (106). The second refrigerant pipe has a horizontal pipe section (202), a first curved section (203), a vertical pipe section (204) that is substantially vertical to the horizontal pipe section, and a second curved section (205) in this order between the connecting screw section (201) and the c