An improved piping structure of an air conditioner can minimize a vibration by change in a piping shape in looped pipings. In the piping structure, a first directional piping part configured on a same plane is changed to be slanted at a predetermined angle on one end thereof, to be displaced onto a third plane, and to be connected with a second directional piping part configured on a different plane from that of the first directional piping part. Further, the piping structure comprises a vertical piping part wound in an up and down direction and a horizontal piping part connected to the vertical piping part having one end changed at a predetermined slant angle.
