To reduce burnt deposits when a bubble jet is discharged, and improve discharge stability and a high resolution applying property; by using a metallic salt peptide complex, formed of peptide wherein the metallic salt and two or more amino acid are condensed, as organic metal for material of a conductive film.

Opposite element electrodes 2 and 3 are formed onto a base plate 1, by a printed conductor, etc., constituted of e.g. metal or alloy such as Ni, Cr, and Au, etc., metal or metallic oxide such as Pd, Ag, and Au, etc., and glass, etc. A metallic salt peptide complex formed of peptide (wherein metallic salt and two or more amino acid are condensed), palladium acetate, and a glycyl glycylglycine complex, etc., are dissolved in water; to be applied onto the insulated base plate 1, forming the electrode 2 and 3, to be made a film. Then this film is heated and decomposed to form the particulate film (of a palladium oxide particulate between the electrodes 2 and 3) to manufacture a thin film 6, for forming an electron emitting part; and then electrification treatment is made to improve thermal and discharge stability.