The objective of the invention is the low-cost production of a fuse whereof a fuse film does not detach readily from a substrate. This fuse production method comprises: a liquid film forming step (step S102) of forming, at least on a surface (102) of a substrate (100) containing an organic compound, an ink film (110) from a dispersion solution of metal nanoparticles dispersed in a solvent; a heating step (step S138) of heating the ink film (110) so as to vaporize the solvent and melt or sinter the metal nanoparticles, and to soften or melt the surface (102); and a fuse film forming step (step S140) of fusing with each other the molten or sintered metal nanoparticles and the softened or molten main surface to form a fuse film (120) on the surface (102).
