A metal fine particle dispersant is obtained by reaction of a polymer (a) containing a first reactive functional group, an ionic group to be absorbed to metal fine particles, and a polyoxyalkylene side chain with a compound (b) containing a second reactive functional group to be bonded to the first reactive functional group and an active energy ray curable group to be cured by an active energy ray. A metal fine particle dispersion liquid containing the metal fine particle dispersant, metal fine particles, and a dispersion medium is prepared. The metal fine particle dispersion liquid is cured, thereby obtaining a cured film.