Patent ID: 8562847

Claim:
A production method of a hydrogen production filter using a thin film support substrate, comprising a film forming step of forming a Pd alloy film by plating on one surface of a metal base member that is capable of selective etching relative to the thin film support substrate comprising a metal substrate, a plurality of columnar convex portions formed on one surface of said metal substrate, and a plurality of through holes formed at a portion where said columnar convex portions are not formed, so as to pierce said metal substrate, wherein an area of the columnar convex portion non-formed portion occupying on the columnar convex portion formed side is within the range of 20 to 90%, a diffusion joining step of disposing said metal base member on a surface of said thin film support substrate where the columnar convex portions are formed, by diffusion joining said Pd alloy film to the top surfaces of the columnar convex portions, and a removal step of removing said metal base member by selective etching.