Laminated body and method for producing laminated body

A method for producing a laminated body including a substrate and a cured body layer laminated on the substrate, the method comprising:

• a step of laminating a resin film on the substrate to form the cured body layer;
• a step of preliminary-curing the resin film laminated on the substrate at 100° C. to 200° C. to form a preliminary-cured body layer;
• and
• a step of performing a roughening treatment on the surface of the preliminary-cured body layer at 55° C. to 80° C. to form a roughening-treated cured body layer, wherein the resin film includes an epoxy resin, a curing agent, a curing accelerator, and a surface treated substance obtained by performing a surface treatment, using 0.5 to 3.5 parts by weight of a silane coupling agent, on 100 parts by weight of an inorganic filler with a mean particle diameter of 0.05 to 1.5 μm, and the resin film is formed using a resin composition in which a contained amount of the surface treated substance is within a range from 10 wt % to 80 wt % in a total 100 wt % of the epoxy resin, the curing agent, the curing accelerator, and the surface treated substance, and
• the silane coupling agent is a silane coupling agent that includes a functional group reactable with the epoxy resin or the curing agent, and the functional group is an epoxy group, an imidazole group, or an amino group.