An air conditioner , the air conditioner comprises: a housing comprising: an air outlet passage formed in the housing ; and an air outlet formed in an edge of an end of the housing and communicated with the air outlet passage; a first air guiding plate disposed adjacent to the air outlet, and rotatably connected with the housing through a first rotating shaft on the housing ; and a second air guiding plate rotatably disposed in the air outlet passage, and being capable of rotating around a second rotating shaft on the housing , wherein the air conditioner is operable in a breezeless mode, in response to the air conditioner operating in the breezeless mode, at least a part of the air outlet is shielded by the first air guiding plate , characterized in that , after the air outlet is closed by the first air guiding plate , the first air guiding plate comprises: a first side close to an upper side of the air outlet, and a second side close to a lower side of the air outlet; wherein the first rotating shaft comprises: a first surface extending from the first rotating shaft towards the first side; and a second surface extending from the first rotating shaft towards an edge of an end of the upper side of the air outlet, wherein α is an angle between the first surface and the second surface, and α is no less than 0° and no more than 5°, when the air conditioner is operating in a breezeless mode. a housing comprising: an air outlet passage formed in the housing ; and an air outlet formed in an edge of an end of the housing and communicated with the air outlet passage; an air outlet passage formed in the housing ; and an air outlet formed in an edge of an end of the housing and communicated with the air outlet passage; a first air guiding plate disposed adjacent to the air outlet, and rotatably connected with the housing through a first rotating shaft on the housing ; and a second air guiding plate rotatably disposed in the air outlet passage, and being capable of rotating around a second rotating shaft on the housing , wherein the air conditioner is operable in a breezeless mode, in response to the air conditioner operating in the breezeless mode, at least a part of the air outlet is shielded by the first air guiding plate , characterized in that , after the air outlet is closed by the first air guiding plate , the first air guiding plate comprises: a first side close to an upper side of the air outlet, and a second side close to a lower side of the air outlet; a first side close to an upper side of the air outlet, and a second side close to a lower side of the air outlet; wherein the first rotating shaft comprises: a first surface extending from the first rotating shaft towards the first side; and a second surface extending from the first rotating shaft towards an edge of an end of the upper side of the air outlet, wherein α is an angle between the first surface and the second surface, and α is no less than 0° and no more than 5°, when the air conditioner is operating in a breezeless mode. a first surface extending from the first rotating shaft towards the first side; and a second surface extending from the first rotating shaft towards an edge of an end of the upper side of the air outlet, wherein α is an angle between the first surface and the second surface, and α is no less than 0° and no more than 5°, when the air conditioner is operating in a breezeless mode. <EOS>