To provide a magnetic therapy device effectively treating various symptoms such as muscle fatigue.

In the step of producing a powder mixture of ores or the like, ores 0101 or the like are formed into powder 0102, and mixed at a predetermined rate, and powder mixture 0103 of ores or the like is obtained. In a kneading step, hemihydrate gypsum 0201, the powder mixture 0202 of ores or the like, tourmaline powder 0203, white sugar 0204, and water 0205 are put into a kneading container 0206, and then the mixture is kneaded by, for example, stirring the mixture by blades 0208 rotated by a motor 0207. In a drying step, the kneaded mixture 0301 produced in the kneading step is poured into a mold 0305 of a molding container 0304 from the kneading container 0302 through a funnel 0303 or the like. The molding container is closed with a lid 0306, leaving the molding container to stand for approximately one hour. Hardened gypsum is removed from the molding container, and dried using a dryer 0307 or the like, and thus the magnetic therapy device is obtained.