An air-conditioning indoor unit includes: a heat exchanger of a refrigerant circuit; a drain pan installed below the heat exchanger; a fan configured to send air to the heat exchanger; a control box containing control parts configured to control operation of the fan and other components; and a casing, in which the heat exchanger, drain pan, fan, and control box are stored in the casing, a drain pan inlet-outlet port is formed in the casing, a hinge assembly is installed on a side plate of the casing, and the control box is coupled to the casing so as to be able to be taken in and out of the drain pan inlet-outlet port of the casing. This allows the drain pan to be attached and detached to and from the casing by removing internal wiring from the control box without removing the control box from the casing.