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 through which refrigerant is passed inside the heat exchanger , wherein each of the refrigerant passages is formed as a single independent passage from a refrigerant inlet to a refrigerant outlet , 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 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 , the auxiliary front heat-exchange unit being positioned upwind of the main front heat-exchange unit , and in that each of the refrigerant passages is a passage passing through the auxiliary front heat-exchange unit , the main front heat-exchange unit and the rear heat-exchange unit , the refrigerant inlet during cooling operation is provided in the auxiliary front heat-exchange unit , and the refrigerant outlet 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 through which refrigerant is passed inside the heat exchanger , wherein each of the refrigerant passages is formed as a single independent passage from a refrigerant inlet to a refrigerant outlet , 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 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 , the auxiliary front heat-exchange unit being positioned upwind of the main front heat-exchange unit , and in that each of the refrigerant passages is a passage passing through the auxiliary front heat-exchange unit , the main front heat-exchange unit and the rear heat-exchange unit , the refrigerant inlet during cooling operation is provided in the auxiliary front heat-exchange unit , and the refrigerant outlet during cooling operation is provided in the rear heat-exchange unit . <EOS>