Method for forming metal pattern, and electric conductor

A method for forming a metal pattern comprising silver on a pattern formation section set in a part or the whole of a region on a base material,

• the base material comprising a fluorine-containing resin layer on a surface including at least the pattern formation section,
• the method comprising the steps of:
• forming a functional group on a pattern formation section of the fluorine-containing resin layer, wherein the functional group is at least one of a carboxy group, a hydroxyl group, or a carbonyl group;
• then applying to the surface of the base material a metal fine particle dispersion liquid in which metal fine particles consisting of silver and having an average particle size of not less than 5 nm and not more than 100 nm and protected by an amine compound as a first protective agent and a fatty acid as a second protective agent are dispersed in a solvent, wherein the fatty acid as a second protective agent includes at least one of oleic acid, stearic acid, linoleic acid, lauric acid and butanoic acid, and the ratio (molfatty acid/molmetal) of the mol number of the fatty acid (molfatty acid) to the mol number of metal (molmetal) is not less than 0.001 and not more than 0.05;
• and
• fixing the metal fine particles on the pattern formation section by bonding the metal fine particles to the functional group.