An air conditioner in which all the pressure pulsations generated in a compressor can be reduced both in cooling operation and in heating operation and in which a muffler has commonality. The air conditioner (1) has a refrigerant circuit (7) constructed from a compressor (2) for compressing the refrigerant, an indoor heat exchanger (3), an outdoor heat exchanger (4), and a four-way switchover valve (5) that are interconnected by refrigerant piping (6). The four-way switchover valve (5) switches the flow of the refrigerant compressed by the compressor (2) to either the indoor heat exchanger (3) or the outdoor heat exchanger (4). The air conditioner (1) further has a pressure pulsation reduction component (8) disposed between the four-way switchover valve (5) and the indoor heat exchanger (3). The pressure pulsation reduction component (8) reduces pressure pulsations in the refrigerant circuit (7). The pressure pulsation is generated by the compressor (2).