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.