An air-conditioning indoor unit comprising: a cooler; and a drain pan configured to receive drain water generated on a surface of the cooler and drain the drain water to an outside, wherein the drain pan includes: a drain pan body configured to receive the drain water, the drain pan body including: a drain water collecting part configured to gather the drain water; a socket mounting face formed at a bottom face of the drain water collecting part; and a socket mounting hole formed in an inner face of the drain water collecting part and in communication with the outside; a drain socket including: a drain nozzle part inserted into the socket mounting hole; and a horizontal plate part placed on the socket mounting face; a waterproof sheet configured to cover an inner face and a bottom face of the drain pan body; and an adhesive that adheres the waterproof sheet to the drain pan body, characterized by a top face of an edge portion of the horizontal plate part of the drain socket is positioned below the bottom face of the drain water collecting part, and the adhesive is applied such that the applied adhesive slopes down toward the top face of the horizontal plate part from a position of a top of the waterproof sheet over an edge portion of the waterproof sheet, the position of the top of the waterproof sheet being placed on an upper position of the edge portion of the horizontal plate. a cooler; and a drain pan configured to receive drain water generated on a surface of the cooler and drain the drain water to an outside, wherein the drain pan includes: a drain pan body configured to receive the drain water, the drain pan body including: a drain water collecting part configured to gather the drain water; a socket mounting face formed at a bottom face of the drain water collecting part; and a socket mounting hole formed in an inner face of the drain water collecting part and in communication with the outside; a drain socket including: a drain nozzle part inserted into the socket mounting hole; and a horizontal plate part placed on the socket mounting face; a waterproof sheet configured to cover an inner face and a bottom face of the drain pan body; and an adhesive that adheres the waterproof sheet to the drain pan body, characterized by a drain pan body configured to receive the drain water, the drain pan body including: a drain water collecting part configured to gather the drain water; a socket mounting face formed at a bottom face of the drain water collecting part; and a socket mounting hole formed in an inner face of the drain water collecting part and in communication with the outside; a drain socket including: a drain nozzle part inserted into the socket mounting hole; and a horizontal plate part placed on the socket mounting face; a waterproof sheet configured to cover an inner face and a bottom face of the drain pan body; and an adhesive that adheres the waterproof sheet to the drain pan body, characterized by a top face of an edge portion of the horizontal plate part of the drain socket is positioned below the bottom face of the drain water collecting part, and the adhesive is applied such that the applied adhesive slopes down toward the top face of the horizontal plate part from a position of a top of the waterproof sheet over an edge portion of the waterproof sheet, the position of the top of the waterproof sheet being placed on an upper position of the edge portion of the horizontal plate.