NOVELTY - A hydrogen separator has cylindrical support body consists of gas permeable cylindrical porous support part, and air-tight cylindrical compact support part extended from the edge part of the porous support part along the axial direction of the porous support part. Porous support part and compact support part are straddled on the surface of the outer periphery of the support body. The hydrogen separator has hydrogen separation film, laminated so that the near-field area at the side of the porous support part of the outer periphery of the compact support part is integrally covered.    USE - Hydrogen separator for separating and purifying hydrogen-containing gas.    ADVANTAGE - Leakage of to-be-separated gas is prevented, and high purity hydrogen gas is obtained.    DETAILED DESCRIPTION - A hydrogen separator has cylindrical support body consists of gas permeable cylindrical porous support part, and air-tight cylindrical compact support part extended from the edge part of the porous support part along the axial direction of the porous support part. Porous support part and compact support part are straddled on the surface of the outer periphery of the support body. The hydrogen separator has hydrogen separation film, laminated so that the near-field area at the side of the porous support part of the outer periphery of the compact support part is integrally covered. In the lamination direction, positioned between the hydrogen separation film and compact support part, an air-tight mixed layer which contains both the constituent material of the hydrogen separation film and the constituent material of the compact support part is provided.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the hydrogen separator along the axial direction.    Hydrogen separator (1)    Hydrogen separation pipe (3)    Attachment bracket (5)    Seal part (7)    Porous support part (11)    Compact support part (13)    Mixed layer (15)    Hydrogen permeable membrane (17)    Ceramic support body (19)