Abstract: An information recording medium is manufactured while placing, in a reaction region, a substrate on the surface of which is recorded information in the form of an indented pattern and the surface of which exhibits electrical conductivity. A plasma generating gas is introduced into a plasma generating region which is isolated from the reaction region. The plasma generating gas is activated by microwaves to generate a plasma. The plasma from the plasma generating region and an organic monomer are introduced into the reaction region independently of each other to initiate polymerization of the organic monomer. A dielectric layer of a polymer of the monomer and of a uniform, small thickness is formed along the indented pattern of the target.