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 (P) 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 (P) 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 . <EOS>