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A heat exchanger includes heat transfer tubes and a header that forms a refrigerant flow path. The header includes: a first member that includes a first plate-shaped portion; a second member that includes a second plate-shaped portion; a third member that includes a third plate-shaped portion positi

A heat exchanger includes heat transfer tubes and a header that forms a refrigerant flow path. The header includes: a first member that includes a first plate-shaped portion; a second member that includes a second plate-shaped portion; a third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged; a fourth member that includes a fourth plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in the first direction and a second opening that constitutes a part of the refrigerant flow path, where a second is along a longitudinal direction of the second opening; and a fifth member.

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1. A heat exchanger comprising: heat transfer tubes; anda header that forms a refrigerant flow path,wherein the header includes: a first member that includes a first plate-shaped portion;a second member that includes a second plate-shaped portion;a third member that includes a third plate-shaped por

1. A heat exchanger comprising: heat transfer tubes; anda header that forms a refrigerant flow path,wherein the header includes: a first member that includes a first plate-shaped portion;a second member that includes a second plate-shaped portion;a third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged;a fourth member that includes: a fourth plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in the first direction; anda second opening that constitutes a part of the refrigerant flow path, where a second direction is along a longitudinal direction of the second opening; anda fifth member that includes a fifth plate-shaped portion positioned between the third plate-shaped portion and the fourth plate-shaped portion in the first direction,wherein the heat transfer tubes are connected to the first plate-shaped portion,wherein the third plate-shaped portion has a first opening that constitutes a part of the refrigerant flow path, where the first opening: extends in a second direction along which the heat transfer tubes are disposed, andincludes a first region, a second region, and a third region that are arranged in order in the second direction,wherein a length of the second region in a third direction, the third direction being perpendicular to both of the first direction and the second direction, is: shorter than a length of the first region in the third direction; andshorter than a length of the third region in the third direction, andwherein the fifth plate-shaped portion has: a third opening that communicates with the third region and the second opening, anda fourth opening that, at a position differing from a position of the third opening in the second direction, communicates with the third region and the second opening. 2. The heat exchanger according to claim 1, wherein the length of the second region in the third direction is larger than or equal to a length of the third plate-shaped portion in the first direction. 3. The heat exchanger according to claim 1, wherein Wf/Tf is less than or equal to 2.5, where Wf is the length of the third region in the third direction and Tf is a length of the third region in the first direction. 4. The heat exchanger according to claim 1, wherein, in the first direction, the first plate-shaped portion, the third plate-shaped portion, the fifth plate-shaped portion, the fourth plate-shaped portion, and the second plate-shaped portion are arranged in order. 5. The heat exchanger according to claim 4, further comprising: a sixth member that includes a sixth plate-shaped portion positioned between the first plate-shaped portion and the third plate-shaped portion in the first direction,wherein the sixth plate-shaped portion has fifth openings that are arranged in the second direction to correspond with the heat transfer tubes. 6. The heat exchanger according to claim 5, wherein, when viewed in the first direction, the first region and the fifth openings do not overlap each other, andwherein the sixth member includes a wall portion that covers the first region in an entirety thereof from a side of connection positions of the heat transfer tubes. 7. The heat exchanger according to claim 5, wherein, when viewed from the first direction, the fifth openings are positioned within a range of a region obtained by extending in a virtual manner the second region in the second direction. 8. The heat exchanger according to claim 4, further comprising: a liquid refrigerant pipe connected to the second plate-shaped portion,wherein the fourth plate-shaped portion further has a sixth opening,wherein the fifth plate-shaped portion further has a seventh opening, andwherein a connection portion between the second plate-shaped portion and the liquid refrigerant pipe communicates with the first region via the sixth opening and the seventh opening. 9. The heat exchanger according to claim 1, wherein, in the first direction, the first plate-shaped portion, the fourth plate-shaped portion, the fifth plate-shaped portion, the third plate-shaped portion, and the second plate-shaped portion are arranged in order. 10. The heat exchanger according to claim 1, wherein the heat transfer tubes include a first heat transfer tube that guides a refrigerant to the third region and a second heat transfer tube that allows the refrigerant that has passed through the third region to flow. 11. The heat exchanger according to claim 1, further comprising: a refrigerant pipe connected to the header,wherein the header forms the refrigerant flow path between the refrigerant pipe and the heat transfer tubes. 12. The heat exchanger according to claim 1, wherein lengths of the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion in the first direction are each 3 mm or less. 13. The heat exchanger according to claim 1, wherein the second direction is a vertical direction of the heat exchanger. 14. The heat exchanger according to claim 13, wherein the first region, the second region, and the third region are arranged in order from a bottom of the heat exchanger, andwherein a length of the third region in the vertical direction is longer than a length of the first region in the vertical direction. 15. The heat exchanger according to claim 1, further comprising: a liquid refrigerant pipe connected to the header,wherein the header is connected to the first region and includes a flow path that extends in the header from the liquid refrigerant pipe, andwherein, when viewed from the first direction, a connection portion between the first region and the flow path, the second region, and the third region are arranged in the second direction. 16. A heat pump device comprising: the heat exchanger according to claim 1. 17. The heat pump device according to claim 16, further comprising: a fan that produces an air flow that passes through the heat exchanger,wherein the header includes a plate-shaped portion that is positioned between an end portion of each of the heat transfer tubes and the third plate-shaped portion, andthat has openings, andwherein the openings are disposed closer to a windward end portion of the plate-shaped portion than a leeward end portion of the plate-shaped portion in an air flow direction. 18. A heat exchanger comprising: heat transfer tubes; anda header that forms a refrigerant flow path,wherein the header includes: a first member that includes a first plate-shaped portion;a second member that includes a second plate-shaped portion; anda third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged,wherein the heat transfer tubes are connected to the first plate-shaped portion,wherein the third plate-shaped portion has a first opening that constitutes a part of the refrigerant flow path, where the first opening: extends in a second direction that is a direction in which the heat transfer tubes are arranged, andincludes a first region, a second region, and a third region that are arranged in order in the second direction,wherein a length of the second region in a third direction, the third direction being perpendicular to both of the first direction and the second direction, is: shorter than a length of the first region in the third direction; andshorter than a length of the third region in the third direction,wherein the second direction is a vertical direction of the heat exchanger, andwherein the first region, the second region, and the third region are arranged in order from a bottom of the heat exchanger, andwherein a length of the third region in the vertical direction is longer than a length of the first region in the vertical direction. 19. A heat pump device comprising: a heat exchanger; anda fan that produces an air flow that passes through the heat exchanger,wherein the heat exchanger includes: heat transfer tubes; anda header that forms a refrigerant flow path, wherein the header includes a first member that includes a first plate-shaped portion,a second member that includes a second plate-shaped portion, anda third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged,wherein the heat transfer tubes are connected to the first plate-shaped portion,wherein the third plate-shaped portion has a first opening that constitutes a part of the refrigerant flow path, where the first opening: extends in a second direction that is a direction in which the heat transfer tubes are arranged, andincludes a first region, a second region, and a third region that are arranged in order in the second direction,wherein a length of the second region in a third direction, the third direction being perpendicular to both of the first direction and the second direction, is: shorter than a length of the first region in the third direction; andshorter than a length of the third region in the third direction,wherein the header includes a plate-shaped portion that is positioned between an end portion of each of the heat transfer tubes and the third plate-shaped portion, and that has openings, andwherein the openings are disposed closer to a windward end portion of the plate-shaped portion than a leeward end portion of the plate-shaped portion in an air flow direction.