To provide an adsorbent which is capable of easily adsorbing, eliminating and continuously using a volatile organic compound and hydrogen, and to provide hydrogen occlusion material.

The volatile organic compound adsorbent and hydrogen occlusion material are composed of an organic carboxylic acid metal complex constituted from a repeating unit represented by general formula [I], wherein M1and M2are a metal which takes bivalent value independently each other, R1a, R1b, R1cand R1ddenote an organic group containing a conjugated system independently each other and R2, R3, R4and R5denote hydrogen atom, alkyl group having 1-4 carbon atoms and an alkenyl group having 1-4 carbon atoms independently each other.

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