A method for manufacturing a complex for carbon dioxide separation, the complex for carbon dioxide separation comprising a support and a carbon dioxide separation layer on the support, and the method comprising:
- applying, on the support, a coating liquid for forming the carbon dioxide separation layer, the coating liquid comprising:
- a water-absorbing polymer,
- an alkali metal salt, and
- a filler having a density lower than a density of the alkali metal salt, a new Mohs hardness of 2 or greater, and a volume average particle diameter that is 30% or less of a thickness of the carbon dioxide separation layer;
- and
- drying the applied coating liquid for forming the carbon dioxide separation layer to obtain the carbon dioxide separation layer.