The direction of pores in an artificial bone can be easily 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, a marker, for example, line symbol 3a, showing the orientation direction of the substantially unidirectionally-oriented pores 2. The marker may be a protrusion, a pit etc. besides line symbol 3a. As a result, the direction of substantially unidirectionally-oriented pores in an artificial bone can be confirmed easily.
