An air conditioner comprising: a housing comprising a discharge port; a heat exchanger included in the housing to heat-exchange the introduced air; a blower fan configured to guide the air heat-exchanged by the heat exchanger to the discharge port; a blade configured to adjust a direction of the air discharged from the discharge port and comprising a first rotation axis at one end thereof and a second rotation axis at an other end thereof; and a blade-driving device configured to drive the blade by a rotational force of a driving motor, wherein the blade-driving device is connected to the first rotation axis and the second rotation axis, respectively, and when the driving motor rotates in one direction, the blade-driving device moves the second rotation axis around the first rotation axis, and when the driving motor is rotated in an opposite direction, the blade-driving device moves the first rotation axis around the second rotation axis; and characterised in that: the blade-driving device comprises: a first link having one end connected to the first rotation axis, a second link having one end connected to the second rotation axis, a rotation member connected to the first link and the second link, respectively and configured to move the first link when the driving motor rotates the blade about the second rotation axis or move the second link when the driving motor rotates the blade about the first rotation axis, a guide member connected to the first link and the second link, respectively and configured to support the first link to be fixed while guiding a movement of the second link when the driving motor rotates the blade about the first rotation axis or to support the second link to be fixed while guiding a movement of the first link when the driving motor rotates the blade about the second rotation axis. a housing comprising a discharge port; a heat exchanger included in the housing to heat-exchange the introduced air; a blower fan configured to guide the air heat-exchanged by the heat exchanger to the discharge port; a blade configured to adjust a direction of the air discharged from the discharge port and comprising a first rotation axis at one end thereof and a second rotation axis at an other end thereof; and a blade-driving device configured to drive the blade by a rotational force of a driving motor, wherein the blade-driving device is connected to the first rotation axis and the second rotation axis, respectively, and when the driving motor rotates in one direction, the blade-driving device moves the second rotation axis around the first rotation axis, and when the driving motor is rotated in an opposite direction, the blade-driving device moves the first rotation axis around the second rotation axis; and characterised in that: the blade-driving device comprises: a first link having one end connected to the first rotation axis, a second link having one end connected to the second rotation axis, a rotation member connected to the first link and the second link, respectively and configured to move the first link when the driving motor rotates the blade about the second rotation axis or move the second link when the driving motor rotates the blade about the first rotation axis, a guide member connected to the first link and the second link, respectively and configured to support the first link to be fixed while guiding a movement of the second link when the driving motor rotates the blade about the first rotation axis or to support the second link to be fixed while guiding a movement of the first link when the driving motor rotates the blade about the second rotation axis. a first link having one end connected to the first rotation axis, a second link having one end connected to the second rotation axis, a rotation member connected to the first link and the second link, respectively and configured to move the first link when the driving motor rotates the blade about the second rotation axis or move the second link when the driving motor rotates the blade about the first rotation axis, a guide member connected to the first link and the second link, respectively and configured to support the first link to be fixed while guiding a movement of the second link when the driving motor rotates the blade about the first rotation axis or to support the second link to be fixed while guiding a movement of the first link when the driving motor rotates the blade about the second rotation axis.