A transfer substrate for transferring a
metal wiring material to a transfer target including a substrate, at least one
metal wiring material formed on the substrate, at least one
coating layer formed on a surface of the
metal wiring material, and an underlying metal film formed between the substrate and the metal wiring material, in which the metal wiring material is a compact formed by
sintering metal powder such as gold
powder having a purity of 99.9 wt % or more and an average particle size of 0.01 μm to 1.0 μm, and the
coating layer is a predetermined metal such as gold or an
alloy having a different composition from that of the metal wiring material and has a
total thickness of 1 μm or less, and the metal underlying film is made of a predetermined metal such as gold or an
alloy. The transfer substrate can lower
heating temperature on the transfer target side.