An air conditioner comprising: a main body with an opening formed in the bottom; a ceiling panel arranged under the main body for covering the opening, and having sucking hole for sucking air therethrough and a discharge hole for discharging air therethrough; a fan detachably installable inside the main body through the opening for guiding indoor air to be sucked in through the sucking hole in the vertical direction and discharged in the horizontal direction, and having a plurality of wings and a shroud having an absorbing hole located above the sucking hole; a heat exchanger arranged in the radial direction of the fan to be separated from the fan for performing heat exchange on the air discharged from the fan; a bell mouth installed between the fan and the sucking hole for efficiently guiding indoor air to the fan; and a guide member (70,90,95) arranged between the fan and the heat exchanger in the radial direction of the fan to surround the fan and be separated from the fan for guiding the air discharged from the fan toward the heat exchanger, wherein the guide member (70,90,95) comprises a curved part (71,91,95a) slantingly curved upward from the bottom part of the heat exchanger toward the fan for guiding the air discharged from the fan toward the heat exchanger, and a connecting part (72, 92) extending downward from the curved part (71, 91, 96) to connect the curved part (71, 91, 96) and the bell mouth, wherein the connecting part (72, 92) is configured to connect to a top end of an inner end of the curved part (71, 91) and a top face of a bottom outer circumferential part of the bell mouth. a main body with an opening formed in the bottom; a ceiling panel arranged under the main body for covering the opening, and having sucking hole for sucking air therethrough and a discharge hole for discharging air therethrough; a fan detachably installable inside the main body through the opening for guiding indoor air to be sucked in through the sucking hole in the vertical direction and discharged in the horizontal direction, and having a plurality of wings and a shroud having an absorbing hole located above the sucking hole; a heat exchanger arranged in the radial direction of the fan to be separated from the fan for performing heat exchange on the air discharged from the fan; a bell mouth installed between the fan and the sucking hole for efficiently guiding indoor air to the fan; and a guide member (70,90,95) arranged between the fan and the heat exchanger in the radial direction of the fan to surround the fan and be separated from the fan for guiding the air discharged from the fan toward the heat exchanger, wherein the guide member (70,90,95) comprises a curved part (71,91,95a) slantingly curved upward from the bottom part of the heat exchanger toward the fan for guiding the air discharged from the fan toward the heat exchanger, and a connecting part (72, 92) extending downward from the curved part (71, 91, 96) to connect the curved part (71, 91, 96) and the bell mouth, wherein the connecting part (72, 92) is configured to connect to a top end of an inner end of the curved part (71, 91) and a top face of a bottom outer circumferential part of the bell mouth.