Provided is a method for manufacturing a porous body by which a porous body including a plurality of layers different from each other in pore diameter may be manufactured by a fewer steps than before. The method includes: synthesizing a mixture of a non-interpenetrated metal-organic framework and an interpenetrated metal-organic framework; and obtaining a porous body including a stack of a non-interpenetrated metal-organic framework layer and an interpenetrated metal-organic framework layer from the mixture synthesized in the synthesizing, via a process of separating the non-interpenetrated metal-organic framework and the interpenetrated metal-organic framework from each other by utilizing density differences.