To provide a scaffold having excellent mechanical strength and cell growth capability and is suitable for use as a cell culture medium or a prosthetic material.The present invention relates to a scaffold composed of an assembly of fibers and having a 3-D structure consisting of two end faces and a side face, wherein(1) the fibers are aligned in a plane direction(2) the fibers have a diameter of 0.05 to 50 µm(3) the fibers are essentially composed of a biocompatible polymer and(4) the scaffold has an apparent density of 95 to 350 kg/m3.
