To provide a method of manufacturing a plasmon resonance type photoelectric conversion element, by which the corrosion of metal microparticles which absorb light by plasmon and their elution into an electrolytic solution can be suppressed.

The manufacturing a plasmon resonance type photoelectric conversion element including an anode electrode having a transparent electrode layer, a metal microparticle layer, a semiconductor thin film made of n-type semiconductor, and a pigment adsorption layer, which are stacked on a transparent substrate in turn, a cathode electrode opposed to the cathode electrode, and an electrolyte disposed between the electrodes and including oxidation-reduction species comprises the steps of: forming the metal microparticle layer on the transparent electrode layer formed on the transparent substrate; and forming the semiconductor thin film by coating the metal microparticle layer heated to a given temperature with a fine particle fluid dispersion of the n-type semiconductor or a precursor solution of the fine particle by a spray method, and evaporating the solvent of the fluid dispersion in a very short time or thermally decomposing the precursor.