An air conditioner comprising: a main body having an air intake port formed at a front side thereof and having a side air discharge port and a lower air discharge port formed therein; an intake port panel disposed to move forward/backward with respect to the main body, and defining an air intake channel vertically opened in cooperation with the main body, the air intake channel P is opened at the top and the bottom; when moving forward; a lower discharge vane straight guiding air discharged to the lower air discharge port; a side discharge vane guiding the air discharged to the side air discharge port to a side of the intake port panel while changing the flow direction of the air; wherein the side discharge vane is larger in size than the side air discharge port; wherein the side discharge vane includes: a first vane part of which the vertical rotational center is positioned inside the main body; a second vane part extending from the first vane part and having an inclination angle of an obtuse angle with the first vane part; wherein a first vane part receiving portion where the first vane part is rotatably received is formed in the main body; wherein the first vane part receiving portion is larger in size than the side air discharge port; and wherein a second vane part receiving portion where the second vane part is rotatably received is recessed on a side of the main body. a main body having an air intake port formed at a front side thereof and having a side air discharge port and a lower air discharge port formed therein; an intake port panel disposed to move forward/backward with respect to the main body, and defining an air intake channel vertically opened in cooperation with the main body, the air intake channel P is opened at the top and the bottom; when moving forward; a lower discharge vane straight guiding air discharged to the lower air discharge port; a side discharge vane guiding the air discharged to the side air discharge port to a side of the intake port panel while changing the flow direction of the air; wherein the side discharge vane is larger in size than the side air discharge port; wherein the side discharge vane includes: a first vane part of which the vertical rotational center is positioned inside the main body; a second vane part extending from the first vane part and having an inclination angle of an obtuse angle with the first vane part; wherein a first vane part receiving portion where the first vane part is rotatably received is formed in the main body; wherein the first vane part receiving portion is larger in size than the side air discharge port; and wherein a second vane part receiving portion where the second vane part is rotatably received is recessed on a side of the main body. a first vane part of which the vertical rotational center is positioned inside the main body; a second vane part extending from the first vane part and having an inclination angle of an obtuse angle with the first vane part; wherein a first vane part receiving portion where the first vane part is rotatably received is formed in the main body; wherein the first vane part receiving portion is larger in size than the side air discharge port; and wherein a second vane part receiving portion where the second vane part is rotatably received is recessed on a side of the main body.