The invention provides an air conditioner which can improve the indoor air quality and is easy to repair. The air conditioner consists of a suction mouth, a filter, a heat exchanger, a cross flow type air blower and an outlet. The suction mouth only set at upper portion and a blocking element arranged among an automatic sweeping mechanism with the filter, a front panel jumping freely and the heatexchanger projecting upwards cause the winding and rewinding portion of the functional part at the side of heat exchanger of the blocking element to be arranged facing to the air flow generated by the air blower. The blocking element is provided with an opening for assembling and disassembling the function part and a cover for blocking the opening.