The present invention relates to an apparatus for relaxing a respiratory tract and a bronchial tube, wherein the apparatus is manufactured in a form of a necklace hung on the neck, and a color light in the visible light wavelength band is irradiated at the region of the Tiantu point, which is known to be useful for the prevention and treatment of human respiratory diseases, that is, a dent region at which ends of left and right clavicle meet each other below the front of the neck, for a predetermined time to induce the secretion of a material for relaxing muscles (e.g., nitrogen monoxide or the like) in muscular cells of the respiratory tract and the bronchial tube, thereby relaxing the respiratory tract and the bronchial tube.