To provide an aldehyde removing agent that can maintain high gas removal performance over a long period of time in the temperature and humidity range for normal life activities and can also have a reduced environmental impact. The problem is solved by using an NH group-containing compound-carrying porous metal complex or a porous metal complex including an NH group-containing organic ligand. For example, the porous metal complex includes at least one metal selected from elements belonging to Groups 2, 4, and 7 to 14 of the periodic table.
