To provide a porous body having uniform fine pores and excellent formability and to provide a porous carbon material formable into lump-like, fibrous, sheet-like or film-like shape and having uniform fine pores.

A micelle-containing organic polymer comprises at least one peak in its X-ray diffraction pattern, at least one pair of the diffraction angle (2θ) and the lattice spacing (d) of said peak satisfying the relation (1): 2θ=2sin-1 (λ/2d) and (d) is at least one value within the range of not less than 0.8 nm to not more than 150 nm. In formula (1), λ represents the wavelength (nm) of the characteristic X-ray Kα1.