AIR CONDITIONER

An air conditioner aiming at reduction of energy consumption without impairing the comfortable feeling which comprises room temperature detection means for detecting the room temperature of an air-conditioned room temperature setting means for setting a target temperature air conditioning means for performing air conditioning operation to bring the room temperature detected by the room temperature detection means toward the target temperature, and target temperature changing means, which corrects the target temperature to rise and fall periodically in accordance with a predetermined rule after the room temperature has substantially reached the target temperature through air conditioning operation of the air conditioning means and shifts the average value of the target temperature after the start of the correction in such a direction that the air conditioning load of the air conditioning means is thereby lightened from that for attaining the target temperature before the correction.