Porous implant material

The invention has strength characteristics similar to human bone and ensures adequate bonding with bone even while avoiding the occurrence of stress shielding. Multiple porous metal bodies (4, 5) with differing porosities that have three dimensional reticulated structures with multiple communicating pores (3) formed by a continuous backbone (2) are bonded via bonding interfaces (F) that are parallel in one direction. Moreover, for said porous metal bodies (4, 5), at least the pores (3B) formed in the porous metal body (5) of the higher porosity are formed in a flat shape that is long in a direction parallel to the bonding interfaces and short in the direction orthogonal to the bonding interfaces and formed so that the length Y of the pores (3B) in a direction parallel to the bonding interfaces is 1.2 times to 5 times the length X in the direction orthogonal to the bonding interfaces. The porosity of the overall composite of said porous metal bodies is 50% to 92%. The strength when compressed in a direction parallel to the bonding interfaces is 1.4 times to 5 times the strength when compressed in the direction orthogonal to the bonding interfaces.