To provide a molding die fixing device which shows excellent operability during fixing a molding die to the specified position of a mold fixture and likewise, excellent operability during removing the molding die from the mold fixture, and a casting device and a molding device which are capable of manufacturing a roller with superb dimensional precision.

The molding die fixing device 1 is equipped with the mold fixture 20 for fixing the molding die 100 configured of end parts blocking both end openings of a cylindrical mold. The mold fixture 20 has at least, two contact surfaces which come into contact with the molding die 100, and is fitted to the molding die fixing device 1 so as to allow the contact surfaces to assume a perpendicular position. At least, either the mold fixture 20 or the cylindrical mold, is formed of a hard magnetic material, while the other is formed of a hard magnetic material or a soft magnetic material. Also, the casting device and the molding device are each equipped with the molding die fixing device 1.