Provided is: a semi-cured body capable of reducing the surface roughness of a roughening-treated surface, and, when a metal layer is formed on the surface of a cured body after curing, increasing the adhesive strength between the cured body and the metal layer; and a laminated body obtained by using the semi-cured body.A semi-cured body 1 is formed by performing a roughening treatment on a reactant obtained by reacting a resin composition which includes an epoxy resin, a curing agent, and a silica component in which silica particles with a mean particle diameter equal to or less than 1 μm are surface treated with a sane coupling agent, such that the reactant has a gel fraction equal to or higher than 90% after being immersed in methyl ethyl ketone for 24 hours at 23° C. A laminated body comprises a cured body obtained by curing the semi-cured body 1, and a metal layer formed by having a plate processing performed on the surface of the cured body. The adhesive strength between the cured body and the metal layer is equal to or larger than 4.9/cm.