An air conditioner comprising: a case having a suction port (12A, 14A, 15A) and a discharge port; a fan provided inside the case to generate a flow of air from the suction port (12A, 14A, 15A) toward the discharge port; an heat exchanger comprising a first heat exchange part which is provided at an inlet side of the fan, and a second heat exchange part which is bent and extends from the first heat exchange part; and an orifice being provided at an outlet side of the fan and between the second heat exchange part and a partition wall in a left and right direction to guide the air discharged from the fan toward the discharge port, wherein the orifice comprises: a main body having a ring shape extending from the discharge port to the fan, characterized in that the orifice further comprises: a first fastening guide part which is provided at one side of the main body and includes a first flat surface part having the same shape as that of one side surface of the second heat exchange part; a second fastening guide part which is provided at the other side of the main body and includes a second flat surface part having the same shape as that of a rear surface of the partition wall; and an extending part provided between the fan and the second heat exchange part and extending from the main body toward the fan to block a noise from the fan from being transmitted toward the second heat exchanger. a case having a suction port (12A, 14A, 15A) and a discharge port; a fan provided inside the case to generate a flow of air from the suction port (12A, 14A, 15A) toward the discharge port; an heat exchanger comprising a first heat exchange part which is provided at an inlet side of the fan, and a second heat exchange part which is bent and extends from the first heat exchange part; and an orifice being provided at an outlet side of the fan and between the second heat exchange part and a partition wall in a left and right direction to guide the air discharged from the fan toward the discharge port, wherein the orifice comprises: a main body having a ring shape extending from the discharge port to the fan, characterized in that the orifice further comprises: a first fastening guide part which is provided at one side of the main body and includes a first flat surface part having the same shape as that of one side surface of the second heat exchange part; a second fastening guide part which is provided at the other side of the main body and includes a second flat surface part having the same shape as that of a rear surface of the partition wall; and an extending part provided between the fan and the second heat exchange part and extending from the main body toward the fan to block a noise from the fan from being transmitted toward the second heat exchanger. a main body having a ring shape extending from the discharge port to the fan, characterized in that the orifice further comprises: a first fastening guide part which is provided at one side of the main body and includes a first flat surface part having the same shape as that of one side surface of the second heat exchange part; a second fastening guide part which is provided at the other side of the main body and includes a second flat surface part having the same shape as that of a rear surface of the partition wall; and an extending part provided between the fan and the second heat exchange part and extending from the main body toward the fan to block a noise from the fan from being transmitted toward the second heat exchanger. a first fastening guide part which is provided at one side of the main body and includes a first flat surface part having the same shape as that of one side surface of the second heat exchange part; a second fastening guide part which is provided at the other side of the main body and includes a second flat surface part having the same shape as that of a rear surface of the partition wall; and an extending part provided between the fan and the second heat exchange part and extending from the main body toward the fan to block a noise from the fan from being transmitted toward the second heat exchanger.