Porous composite and bone regeneration material

[Problem to be Solved] To provide a porous composite that has excellent uniform dispersability of OCP and that comprises OCP and collagen in a sufficiently mixed state; and a bone regeneration material comprising the porous composite. [Means for Solution] A porous composite comprising octacalcium phosphate and collagen, characterized in that in an image obtained by enlarging a 5.0-mm×5.0-mm range of a plane of the porous composite 15 times with a scanning electron microscope (SEM), agglomerated particles of octacalcium phosphate have a fractal dimension (D) of 0.70 or more; and the area of c) portions consisting of collagen accounts for 5% or less of the total area of a) portions consisting of agglomerated particles of octacalcium phosphate, b) portions consisting of octacalcium phosphate microparticles and collagen, and the c) portions consisting of collagen.