A semiconductor device has a field insulating film provided on a semiconductor substrate, and a fuse provided on the field insulating film and having a fuse trimming laser irradiation portion and fuse terminals. The precursor solution may further include a metal compound or a metalloid compound. 0 times its original length having a diameter of 125-600 microns and containing 0. 02 wt % based on the aqueous medium, the latex particles having an average particle size of 0. This ring rolling mill further includes a mechanism which inclines and supports the mandrel with respect to the rotation axis of the main roll such that the gap between the outer peripheral surface of the mandrel and the outer peripheral surface of the main roll differs on one side and on the other side as seen in a direction along the rotation axis of the main roll.