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A heat exchanger includes a header pipe, an inlet manifold, an outlet manifold, and coupling members. The header pipe includes a fluid circulation hole inside. The inlet manifold supplies a fluid to the fluid circulation hole of the header pipe. The outlet manifold discharges the fluid from the flui

A heat exchanger includes a header pipe, an inlet manifold, an outlet manifold, and coupling members. The header pipe includes a fluid circulation hole inside. The inlet manifold supplies a fluid to the fluid circulation hole of the header pipe. The outlet manifold discharges the fluid from the fluid circulation hole of the header pipe. The header pipe is connected to the inlet manifold and the outlet manifold though the coupling members.

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What is claimed is: 1. A heat exchanger comprising: a header pipe including a fluid circulation hole inside thereof; an inlet manifold including an inlet hole inside thereof; an outlet manifold including an outlet hole inside thereof; a first coupling member including a first coupling hole inside

What is claimed is: 1. A heat exchanger comprising: a header pipe including a fluid circulation hole inside thereof; an inlet manifold including an inlet hole inside thereof; an outlet manifold including an outlet hole inside thereof; a first coupling member including a first coupling hole inside thereof; and a second coupling member including a second coupling hole inside thereof; wherein a first end of the first coupling member is connected to a first end of the header pipe and a second end of the first coupling member is connected to the inlet manifold, wherein a first end of the second coupling member is connected to a second end of the header pipe and a second end of second coupling member is connected to the outlet manifold, wherein in the first coupling member, a first end of the first coupling hole is opened to a first end of the fluid circulation hole and a second end of the first coupling hole is opened to the inlet hole, wherein in the second coupling member, a first end of the second coupling hole is opened to a second end of the fluid circulation hole and a second end of the second coupling hole is opened to the outlet hole, wherein a first pipe side connection hole, which has a diameter that is larger than that of the first end of the fluid circulation hole and which is for housing the first end of the first coupling member, is formed on the first end of the header pipe, and wherein a second pipe side connection hole, which has a diameter that is larger than that of the second end of the fluid circulation hole and which is for housing the first end of the second coupling member, is formed on second end of the header pipe. 2. The heat exchanger according to claim 1, wherein a first manifold side connection hole for housing the second end of the first coupling member is formed on a side surface of the inlet manifold, and wherein a second manifold side connection hole for housing the second end of the second coupling member is formed on a side surface of the outlet manifold. 3. The heat exchanger according to claim 1, wherein the first coupling member includes a plurality of first coupling holes, and wherein the second coupling member includes a plurality of second coupling holes. 4. The heat exchanger according to claim 3, wherein all of the first coupling holes have identical diameters. 5. The heat exchanger according to claim 3, wherein all of the second coupling holes have identical diameters. 6. The heat exchanger according to claim 3, wherein the header pipe includes a plurality of fluid circulation holes. 7. The heat exchanger according to claim 6, wherein the first coupling members are equal in number to the number of the fluid circulation holes, and wherein each of the first coupling members includes a first coupling hole opened to a respective fluid circulation hole. 8. The heat exchanger according to claim 7, wherein the second coupling members are equal in number to the number of the fluid circulation holes, and wherein each of the second coupling members includes a second coupling hole opened to a respective fluid circulation hole. 9. The heat exchanger according to claim 6, wherein the second coupling members are equal in number to the number of the fluid circulation holes, and wherein each of the second coupling members includes a second coupling hole opened to a respective fluid circulation hole. 10. A heat exchanger comprising: a header pipe including a fluid circulation hole inside thereof; an inlet manifold including an inlet hole inside thereof; an outlet manifold including an outlet hole inside thereof; a first coupling member including a first coupling hole inside thereof; and a second coupling member including a second coupling hole inside thereof; wherein a first end of the first coupling member is connected to a first end of the header pipe and a second end of the first coupling member is connected to the inlet manifold, wherein a first end of the second coupling member is connected to a second end of the header pipe and a second end of second coupling member is connected to the outlet manifold, wherein in the first coupling member, a first end of the first coupling hole is opened to a first end of the fluid circulation hole and a second end of the first coupling hole is opened to the inlet hole, wherein in the second coupling member, a first end of the second coupling hole is opened to a second end of the fluid circulation hole and a second end of the second coupling hole is opened to the outlet hole, wherein the first coupling member includes a plurality of first coupling holes, wherein the second coupling member includes a plurality of second coupling holes, and wherein the plurality of first coupling holes have different diameters from each other. 11. The heat exchanger according to claim 10, wherein the plurality of second coupling holes have different diameters from each other. 12. A heat exchanger comprising: a header pipe including a fluid circulation hole inside thereof; an inlet manifold including an inlet hole inside thereof; an outlet manifold including an outlet hole inside thereof; a first coupling member including a first coupling hole inside thereof; and a second coupling member including a second coupling hole inside thereof; wherein a first end of the first coupling member is connected to a first end of the header pipe and a second end of the first coupling member is connected to the inlet manifold, wherein a first end of the second coupling member is connected to a second end of the header pipe and a second end of second coupling member is connected to the outlet manifold, wherein in the first coupling member, a first end of the first coupling hole is opened to a first end of the fluid circulation hole and a second end of the first coupling hole is opened to the inlet hole, wherein in the second coupling member, a first end of the second coupling hole is opened to a second end of the fluid circulation hole and a second end of the second coupling hole is opened to the outlet hole, wherein the first coupling member includes a plurality of first coupling holes, wherein the second coupling member includes a plurality of second coupling holes, and wherein the plurality of second coupling holes have different diameters from each other. 13. A heat exchanger comprising: a header pipe including a fluid circulation hole inside thereof; an inlet manifold including an inlet hole inside thereof; an outlet manifold including an outlet hole inside thereof; a first coupling member including a first coupling hole inside thereof; and a second coupling member including a second coupling hole inside thereof; wherein a first end of the first coupling member is connected to a first end of the header pipe and a second end of the first coupling member is connected to the inlet manifold, wherein a first end of the second coupling member is connected to a second end of the header pipe and a second end of second coupling member is connected to the outlet manifold, wherein in the first coupling member, a first end of the first coupling hole is opened to a first end of the fluid circulation hole and a second end of the first coupling hole is opened to the inlet hole, wherein in the second coupling member, a first end of the second coupling hole is opened to a second end of the fluid circulation hole and a second end of the second coupling hole is opened to the outlet hole, wherein the first coupling member includes a plurality of first coupling holes, wherein the second coupling member includes a plurality of second coupling holes, wherein the header pipe includes a plurality of fluid circulation holes, wherein the first coupling member is a single member including the plurality of first coupling holes opened to respective first ends of the plurality of fluid circulation holes. 14. The heat exchanger according to claim 13, wherein the second coupling member is a single member including the plurality of second coupling holes opened to respective second ends of the plurality of fluid circulation holes.