NOVELTY - A deoxygenation membrane module (100) has a deoxygenation membrane element (10) equipped with deoxygenation membrane (14) containing oxide ceramic with perovskite structure on a porous base material (12), a connection component, and a seal portion. The seal portion has glass matrix containing glass comprising (in %mass) precipitated forsterite crystals, and silica (60-78), alumina (10-22), sodium oxide (3-16), potassium oxide (5-16), calcium oxide (0-4), bismuth oxide (0-4), and magnesium (1-13 by conversion of oxide).    USE - Deoxygenation membrane module is used for oxidation reaction apparatus and diaphragm reactor.    ADVANTAGE - The deoxygenation membrane module having excellent heat resistance, mechanical strength and durability, and reduced gas leakage is efficiently and economically manufactured.    DETAILED DESCRIPTION - A deoxygenation membrane module has a deoxygenation membrane element equipped with a deoxygenation membrane containing oxide ceramic with perovskite structure as oxygen ion conductor on a porous base material, a connection component comprising ceramic joined to deoxygenation membrane element, and a seal portion which blocks gas distribution in junction portion of deoxygenation membrane element and junction portion of connection component. The seal portion has glass matrix containing glass comprising (in %mass) precipitated forsterite crystals, and silica (60-78), alumina (10-22), sodium oxide (3-16), potassium oxide (5-16), calcium oxide (0-4), bismuth oxide (0-4), and magnesium (1-13 by conversion of oxide). INDEPENDENT CLAIMS are included for the following:    (1) material (40) for sealing deoxygenation membrane element and connection component;    (2) manufacture of sealing material; and    (3) manufacture of deoxygenation membrane module.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the deoxygenation membrane module.    Deoxygenation membrane element (10)    Porous base material (12)    Deoxygenation membrane (14)    Sealing material (40)    Deoxygenation membrane module (100)