A drain pan includes: a drain pan unit that includes a horizontal water receiving unit and a vertical water receiving unit intersecting with each other in an L shape and is used as horizontal and vertical types; and a water discharge socket for discharging, from the drain pan unit, drain water received on the drain pan unit. A drain port is opened through a water-receiving surface of each of the horizontal water receiving unit and the vertical water receiving unit at a corner of intersection of the drain pan unit. The water discharge socket entirely covers the drain port on an outer side of the corner, which is a major angle side.