A heat exchanger comprising: a first tube fitting including a through portion, to a first end portion of which a first flat tube is connected and to a second end portion of which a row joint tube different in cross-sectional shape from the first flat tube is connected; a second tube fitting including a through portion, to a first end portion of which a second flat tube is connected and to a second end portion of which the row join tube different in cross-sectional shape from the second flat tube is connected; and a heat exchange unit (21, 31) including the first flat tube, at least an end portion of which is connected to the first end portion of the first tube fitting, and the second flat tube located on a windward side or a leeward side of the first flat tube, wherein a central axis of the first end portion and a central axis of the second end portion of the first tube fitting connected to the first flat tube are deviated from each other, a central axis of the first end portion and a central axis of the second end portion of the second tube fitting connected to the second flat tube are deviated from each other, the second end portion of the first tube fitting connected to the first flat tube and the second end portion of the second tube fitting connected to the second flat tube are connected to each other via the row joint tube, characterised by a distance between the central axis of the second end portion of the first tube fitting connected to the first flat tube and a central axis of the second flat tube is shorter than a distance between the central axis of the first end portion of the first tube fitting connected to the first flat tube and the central axis of the second flat tube, and a distance between the central axis of the second end portion of the second tube fitting connected to the second flat tube and the central axis of the first flat tube is shorter than a distance between the central axis of the first end portion of the second tube fitting connected to the second flat tube and the central axis of the first flat tube. a first tube fitting including a through portion, to a first end portion of which a first flat tube is connected and to a second end portion of which a row joint tube different in cross-sectional shape from the first flat tube is connected; a second tube fitting including a through portion, to a first end portion of which a second flat tube is connected and to a second end portion of which the row join tube different in cross-sectional shape from the second flat tube is connected; and a heat exchange unit (21, 31) including the first flat tube, at least an end portion of which is connected to the first end portion of the first tube fitting, and the second flat tube located on a windward side or a leeward side of the first flat tube, wherein a central axis of the first end portion and a central axis of the second end portion of the first tube fitting connected to the first flat tube are deviated from each other, a central axis of the first end portion and a central axis of the second end portion of the second tube fitting connected to the second flat tube are deviated from each other, the second end portion of the first tube fitting connected to the first flat tube and the second end portion of the second tube fitting connected to the second flat tube are connected to each other via the row joint tube, characterised by a distance between the central axis of the second end portion of the first tube fitting connected to the first flat tube and a central axis of the second flat tube is shorter than a distance between the central axis of the first end portion of the first tube fitting connected to the first flat tube and the central axis of the second flat tube, and a distance between the central axis of the second end portion of the second tube fitting connected to the second flat tube and the central axis of the first flat tube is shorter than a distance between the central axis of the first end portion of the second tube fitting connected to the second flat tube and the central axis of the first flat tube.