A heat exchanger comprising: a plurality of fins arranged in parallel; and a plurality of heat transfer tubes that penetrate the fins, wherein the heat transfer tubes define a plurality of refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) through which refrigerant is passed inside the heat exchanger, wherein each of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) is formed as a single independent passage from a refrigerant inlet (41a, 41b, 41c, 41d, 41e, 41f, 43a, 43b, 43c, 43d) to a refrigerant outlet (42a, 42b, 42c, 42d, 42e, 42f, 44a, 44b, 44c, 44d), wherein the heat exchanger has a front-heat exchange unit and a rear-heat exchange unit, and the front-heat exchange unit and the rear-heat exchange unit is each formed in a chevron shape with an outer periphery portion and an inner periphery portion, the outer periphery portion and the inner periphery portion being respectively located on an upwind side and a downwind side, characterised in that each of the plurality of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) in the front-heat exchange unit and the rear-heat exchange unit is formed as a path extending between the outer periphery portion and the inner periphery portion, in that the front heat-exchange unit includes a main front heat-exchange unit and an auxiliary front heat-exchange unit (21b, 21c), the auxiliary front heat-exchange unit (21b, 21c) being positioned upwind of the main front heat-exchange unit, and in that each of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) is a passage passing through the auxiliary front heat-exchange unit (21b, 21c), the main front heat-exchange unit and the rear heat-exchange unit, the refrigerant inlet (41a, 41b, 41c, 41d, 41e, 41f) during cooling operation is provided in the auxiliary front heat-exchange unit (21b, 21c), and the refrigerant outlet (42a, 42b, 42c, 42d, 42e, 42f) during cooling operation is provided in the rear heat-exchange unit. a plurality of fins arranged in parallel; and a plurality of heat transfer tubes that penetrate the fins, wherein the heat transfer tubes define a plurality of refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) through which refrigerant is passed inside the heat exchanger, wherein each of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) is formed as a single independent passage from a refrigerant inlet (41a, 41b, 41c, 41d, 41e, 41f, 43a, 43b, 43c, 43d) to a refrigerant outlet (42a, 42b, 42c, 42d, 42e, 42f, 44a, 44b, 44c, 44d), wherein the heat exchanger has a front-heat exchange unit and a rear-heat exchange unit, and the front-heat exchange unit and the rear-heat exchange unit is each formed in a chevron shape with an outer periphery portion and an inner periphery portion, the outer periphery portion and the inner periphery portion being respectively located on an upwind side and a downwind side, characterised in that each of the plurality of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) in the front-heat exchange unit and the rear-heat exchange unit is formed as a path extending between the outer periphery portion and the inner periphery portion, in that the front heat-exchange unit includes a main front heat-exchange unit and an auxiliary front heat-exchange unit (21b, 21c), the auxiliary front heat-exchange unit (21b, 21c) being positioned upwind of the main front heat-exchange unit, and in that each of the refrigerant passages (40a, 40b, 40c, 40d, 40e, 40f) is a passage passing through the auxiliary front heat-exchange unit (21b, 21c), the main front heat-exchange unit and the rear heat-exchange unit, the refrigerant inlet (41a, 41b, 41c, 41d, 41e, 41f) during cooling operation is provided in the auxiliary front heat-exchange unit (21b, 21c), and the refrigerant outlet (42a, 42b, 42c, 42d, 42e, 42f) during cooling operation is provided in the rear heat-exchange unit.