A heat exchanger, comprising: a first header tank; a second header tank arranged so as to be apart from the first header tank; and a plurality of heat exchange members, which are each coupled to the first header tank and the second header tank, and are arranged side by side between the first header tank and the second header tank, wherein each of the plurality of heat exchange members includes: a flat pipe extending from the first header tank to the second header tank; and a heat transfer plate integrated with the flat pipe along a longitudinal direction of the flat pipe, wherein a width direction of each of the flat pipes intersects with a direction in which the plurality of heat exchange members are arranged side by side, wherein each of the heat transfer plates includes an extending portion (8, 9) extending outward in the width direction of each of the flat pipes from at least one of one end of a corresponding one of the flat pipes in the width direction and another end of the corresponding one of the flat pipes in the width direction, and wherein each of the flat pipes has one or more flat pipe bent portions, each forming a groove extending along the longitudinal direction of the flat pipes, characterised in that each of the extending portions (8, 9) has one or more heat transfer plate bent portions (12, 15), each forming a groove (13, 16) extending along the longitudinal direction of the flat pipes, wherein each of the plurality of heat exchange members has a center line along the width direction of each of the flat pipes, and wherein, when each of the plurality of heat exchange members is viewed along the longitudinal direction of the flat pipes, a corresponding one of the flat pipes and a corresponding one of the extending portions (8, 9) are continuous on the center line of the heat exchange member. a first header tank; a second header tank arranged so as to be apart from the first header tank; and a plurality of heat exchange members, which are each coupled to the first header tank and the second header tank, and are arranged side by side between the first header tank and the second header tank, wherein each of the plurality of heat exchange members includes: a flat pipe extending from the first header tank to the second header tank; and a heat transfer plate integrated with the flat pipe along a longitudinal direction of the flat pipe, a flat pipe extending from the first header tank to the second header tank; and a heat transfer plate integrated with the flat pipe along a longitudinal direction of the flat pipe, wherein a width direction of each of the flat pipes intersects with a direction in which the plurality of heat exchange members are arranged side by side, wherein each of the heat transfer plates includes an extending portion (8, 9) extending outward in the width direction of each of the flat pipes from at least one of one end of a corresponding one of the flat pipes in the width direction and another end of the corresponding one of the flat pipes in the width direction, and wherein each of the flat pipes has one or more flat pipe bent portions, each forming a groove extending along the longitudinal direction of the flat pipes, characterised in that each of the extending portions (8, 9) has one or more heat transfer plate bent portions (12, 15), each forming a groove (13, 16) extending along the longitudinal direction of the flat pipes, wherein each of the plurality of heat exchange members has a center line along the width direction of each of the flat pipes, and wherein, when each of the plurality of heat exchange members is viewed along the longitudinal direction of the flat pipes, a corresponding one of the flat pipes and a corresponding one of the extending portions (8, 9) are continuous on the center line of the heat exchange member.