To provide a metal complex exhibiting an excellent gas separating performance.

The metal complex includes: a dicarboxylic acid compound which may have substituents; at least one metal selected from chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper, zinc and cadmium; and a bidentate ligand (II) represented by formula (wherein, R5, R6, R7 and R8 are each the same or different, and each represents hydrogen atom or the like; R5 and R6, and R7 and R8 together represent alkylene or the like which may have substituents; n is 1 or 2; R9, R10, R11 and R12 are each the same or different, and each represents hydrogen atom or the like; or R9 and R10, and R11 and R12 together represent alkylene or the like which may have substituents).