Transfer substrate for forming metal wiring and method for forming metal wiring using said transfer substrate

A method of forming a metal wiring, comprising superimposing a transfer substrate for transferring a metal wiring material to a transfer-receiving object, the transfer substrate comprising a substrate, at least one metal wiring material formed on the substrate and an underlying metal film formed between the substrate and the metal wiring material, on a transfer-receiving object on the transfer substrate opposed to the transfer-receiving object, and while heating the transfer substrate and the transfer-receiving object, pressing the transfer substrate, thereby bonding and transferring a metal wiring material to the transfer-receiving object,

• wherein the metal wiring material of the transfer substrate is a molded article formed through sintering a powder consisting of at least one metal powder having a purity of 99.9% by weight or more and an average particle size of 0.01 μm to 1.0 μm, selected from gold powder, platinum powder, palladium powder and copper powder,
• the underlying metal film of the transfer substrate is composed of any metal of gold, silver, platinum, palladium, ruthenium, rhodium, iridium, chromium, titanium, tungsten, tantalum, nickel, copper and zirconium, or an alloy thereof, and
• the transfer substrate is heated at 80 to 200° C. and the transfer-receiving object is heated at 80 to 300° C.