NOVELTY - A hydrogen purification filter (1) consists of a porous support component (2) with a hole region (3), and a hydrogen-permeable membrane (6) containing palladium or palladium alloy, provided on surface (2a) of the porous support component. The hole region contains holes (4) of through-hole shape, with aperture diameter of 15-150 mu m. A diffusion prevention layer containing titanium nitride, is provided on surface of the porous support component. The hydrogen-permeable membrane is joined to porous support component, in peripheral portion (3a) of the hole region.    USE - Hydrogen purification filter used for modifier for fuel cell. Uses include but are not limited to phosphoric acid fuel cell, molten carbonate fuel cell, solid oxide fuel cell, alkaline fuel cell and polymer electrolyte fuel cell.    ADVANTAGE - The hydrogen purification filter has excellent hydrogen-permeation rate and durability under high temperature, and is economical.    DETAILED DESCRIPTION - A hydrogen purification filter consists of a porous support component with a hole region, and hydrogen permeable membrane containing palladium or palladium alloy, provided on surface of the porous support component. The hole region contains holes of through-hole shape, with aperture diameter of 15-150 mu m. A diffusion prevention layer is provided on surface of the porous support component. The diffusion prevention layer is a thin film having electroconductivity, and comprising titanium nitride, titanium carbide, tantalum nitride, tantalum carbide and/or chromium nitride. The hydrogen permeable membrane is joined to porous support component through palladium or palladium alloy layer (7), in peripheral portion of the hole region. The peripheral portion has a width of 2.5-25% with respect to length of the hole region in width direction, and area of 10-75% with respect to area of the hole region. In the area inside joined portion of hole region, the porous support component and the hydrogen-permeable membrane are not joined, palladium layer or palladium alloy layer does not exist in porous support component or exists in a traces.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of the hydrogen purification filter.    Hydrogen purification filter (1)    Porous support component (2)    Surface of porous support component (2a)    Hole region (3)    Peripheral portion (3a)    Hole (4)    Hydrogen-permeable membrane (6)    Palladium or palladium alloy layer (7)