The direction of pores in an artificial bone can beeasily and accurately known.An artificial bone 10 has substantially unidirectionally-oriented pores 2 in the inside of an artificial bone material(artificial bone main body) 1 and has, on its surface, amarker, for example, line symbol 3a, showing the orientationdirection of the substantially unidirectionally-oriented pores2. The marker may be a protrusion, a pit etc. besides linesymbol 3a. As a result, the direction of substantiallyunidirectionally-oriented pores in an artificial bone can beconfirmed easily.
