An air conditioner, comprising: a main body having a suction port and a discharge port; a heat exchanger provided in the main body; a crossflow fan configured to discharge air heat-exchanged by the heat exchanger to the discharge port, wherein the crossflow fan comprises a plurality of unit fans connected to each other in an axial direction of the crossflow fan and a plurality of connecting plates, each of which is disposed between and connects the plurality of the unit fans; and a stabilizer placed adjacent to the crossflow fan and comprising: a guide section having a first guide portion configured to guide an airflow flowing in the main body by the crossflow fan to a suction region and a second guide portion configured to guide the airflow to a discharge region; and a flow separation section connected to the guide section and the flow separation section comprising fan counter parts connected to the first guide portion and extending in the axial direction of the crossflow fan, and wherein the fan counter parts comprise a first portion which is positioned adjacent to a center of each of the plurality of unit fans and a second portion which is positioned adjacent to each of the plurality of connecting plates, and wherein the length of the first portion along a rotational direction of the crossflow fan is less than the length of the second portion along the rotational direction of the crossflow fan. a main body having a suction port and a discharge port; a heat exchanger provided in the main body; a crossflow fan configured to discharge air heat-exchanged by the heat exchanger to the discharge port, wherein the crossflow fan comprises a plurality of unit fans connected to each other in an axial direction of the crossflow fan and a plurality of connecting plates, each of which is disposed between and connects the plurality of the unit fans; and a stabilizer placed adjacent to the crossflow fan and comprising: a guide section having a first guide portion configured to guide an airflow flowing in the main body by the crossflow fan to a suction region and a second guide portion configured to guide the airflow to a discharge region; and a flow separation section connected to the guide section and the flow separation section comprising fan counter parts connected to the first guide portion and extending in the axial direction of the crossflow fan, and wherein the fan counter parts comprise a first portion which is positioned adjacent to a center of each of the plurality of unit fans and a second portion which is positioned adjacent to each of the plurality of connecting plates, and wherein the length of the first portion along a rotational direction of the crossflow fan is less than the length of the second portion along the rotational direction of the crossflow fan. a guide section having a first guide portion configured to guide an airflow flowing in the main body by the crossflow fan to a suction region and a second guide portion configured to guide the airflow to a discharge region; and a flow separation section connected to the guide section and the flow separation section comprising fan counter parts connected to the first guide portion and extending in the axial direction of the crossflow fan, and wherein the fan counter parts comprise a first portion which is positioned adjacent to a center of each of the plurality of unit fans and a second portion which is positioned adjacent to each of the plurality of connecting plates, and wherein the length of the first portion along a rotational direction of the crossflow fan is less than the length of the second portion along the rotational direction of the crossflow fan.