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 . <EOS>