A heat exchange unit includes a plurality of flat tubes, a first header, a second header, and a drain pan. The first header and the second header are connected to both ends of the plurality of flat tubes and are arranged to extend in a first direction in which the plurality of flat tubes is arranged. Each of the plurality of flat tubes includes a first portion, a second portion, and a connecting portion. The drain pan includes a first wall, a second wall, and a receiving portion. The first wall surrounds an opening. The second wall is located outside the first wall. The receiving portion connects the first wall and the second wall below the first header and below the second header. The receiving portion has a first surface that is an upper surface inclined to have a downward gradient from the first wall toward the second wall.