PROBLEM TO BE SOLVED: To provide a porous implant material capable of ensuring sufficient bondability with a bone while having strength characteristics similar to that of a human bone and avoiding the generation of a stress shielding phenomenon, and maintaining the stable strength against a bending load.SOLUTION: A porous metal body includes a central member 2 extending in a length direction, a cylindrical member 3 surrounding the outer peripheral surface other than both end surfaces, and an outer peripheral member 4 arranged in the outer peripheral surface, the members being bonded to one another, wherein the central member 2 and the outer peripheral member 4 each have a three-dimentional mesh structure in which a plurality of pores formed by continuous skeletons continue. The porous metal body has a porosity of 60-98% and the cylindrical member 3 is a dense metal body having a porosity of 0-50%, the outer peripheral member 4 having a predetermined dimension is arranged between a plurality of convex portions 9 of the outer periphery of the cylindrical member 3, the area occupation rate of the dense metal body on a cross section in a direction perpendicular to the length direction is 5-50%, the longitudinal elastic modulus of the entire in compressing in a direction parallel to the length direction is 5-35 GPa, and an elastic modulus is 10-35 GPa.COPYRIGHT: (C)2014,JPO&INPIT【課題】人骨に近い強度特性を有し、ストレスシールディング現象の発生を回避しながらも骨との十分な結合性を確保することができ、曲げ荷重に対しても安定した強度を維持する。【解決手段】長さ方向に延びる中心部材2と、その両端面を除き外周面を囲む筒状部材3と、その外周面に配置された外周部材4とが接合されているとともに、中心部材2及び外周部材4は、連続した骨格により形成される複数の気孔が連通した三次元網目状構造を有する多孔質金属体であって、気孔率が60%~98%であり、筒状部材3は、気孔率が0%~50%の緻密金属体であり、筒状部材3の外周部の複数の凸状部9の間に所定寸法の外周部材4が配置され、長さ方向に直交する方向の断面における緻密金属体の面積占有率が5%~50%であり、長さ方向と平行な方向に圧縮したときの全体の縦弾性率が5GPa~35GPa、曲げ弾性率が10GPa~35GPaである。【選択図】 図1
