Abstract: An air conditioner comprises a device body having first and second air channels, an evaporator disposed in the first air channel for cooling the air passing therethrough, a first drain tray disposed below the evaporator for receiving dew drops formed on the evaporator and falling therefrom and thus for containing the drain, and a second drain tray disposed below the first drain tray for receiving dew drops formed on the first drain tray and falling therefrom and the drain overflowing the first drain tray. The second air channel is defined between the first and second drain trays.