A ceiling-embedded air conditioner comprising: a casing main body embedded in a ceiling; a square decorative panel mounted on the bottom surface of the casing main body ; a turbo fan disposed in the casing main body ; a heat exchanger disposed in the casing main body to surround the outer periphery of the turbo fan ; a drain pan disposed in the casing main body along a bottom side of the heat exchanger ; an air suction path that is disposed in the center of the drain pan and reaches the turbo fan ; an air blowoff path for conditioned air having passed through the heat exchanger , the air blowoff path being provided at four places along the sides of a virtual square (Q) surrounding the air suction path ; an air suction opening that is provided in the decorative panel and communicates with the air suction path ; an air blowoff opening that is provided in the decorative panel and communicates with the air blowoff path ; corner panels that are disposed at a respective corner portion between the adjacent air blowoff openings ; a human sensor (S) for detecting a human body that is exposed at a specific corner panel of the corner panels ; a wind guide path that is provided in the decorative panel for communicating with the air blowoff opening and arranged between ends of the adjacent air blowoff openings ; characterized by wind direction plates rotatably disposed in the air blowoff openings for guiding part of conditioned air blown therefrom to the wind guide path , said part of conditioned airflow being guided into a base end portion of the corner panel along inclined portions included in the wind direction plates ; and windbreak ribs (41 and 42) that are erected from the specific corner panel to suppress a direct strike on the human sensor (S) by the conditioned air flowing from the wind guide path toward the specific corner panel . a casing main body embedded in a ceiling; a square decorative panel mounted on the bottom surface of the casing main body ; a turbo fan disposed in the casing main body ; a heat exchanger disposed in the casing main body to surround the outer periphery of the turbo fan ; a drain pan disposed in the casing main body along a bottom side of the heat exchanger ; an air suction path that is disposed in the center of the drain pan and reaches the turbo fan ; an air blowoff path for conditioned air having passed through the heat exchanger , the air blowoff path being provided at four places along the sides of a virtual square (Q) surrounding the air suction path ; an air suction opening that is provided in the decorative panel and communicates with the air suction path ; an air blowoff opening that is provided in the decorative panel and communicates with the air blowoff path ; corner panels that are disposed at a respective corner portion between the adjacent air blowoff openings ; a human sensor (S) for detecting a human body that is exposed at a specific corner panel of the corner panels ; a wind guide path that is provided in the decorative panel for communicating with the air blowoff opening and arranged between ends of the adjacent air blowoff openings ; characterized by wind direction plates rotatably disposed in the air blowoff openings for guiding part of conditioned air blown therefrom to the wind guide path , said part of conditioned airflow being guided into a base end portion of the corner panel along inclined portions included in the wind direction plates ; and windbreak ribs (41 and 42) that are erected from the specific corner panel to suppress a direct strike on the human sensor (S) by the conditioned air flowing from the wind guide path toward the specific corner panel . <EOS>