The vertebral body spacer 1 of the present invention is used by being inserted between vertebral bodies 101 and 102 (intervertebral). This vertebral body spacer 1 has a pair of abutment surfaces that abut against the respective vertebral bodies 101 and 102, and has a block body 2 made of titanium or a titanium alloy as a main material. The block body 2 includes a needle-like body 40 whose both end portions are needle-like and a through hole 22 penetrating in the thickness direction, and at least a porous portion whose surface porosity is larger than the porosity of the needle-like body 40 21 and the needle-like body 40 is inserted into the through-hole 22 so that both end portions thereof protrude from the respective contact surfaces, whereby the both end portions function to fix the block body 2 between the vertebrae. The protrusion 41 that exhibits the above is configured. ADVANTAGE OF THE INVENTION According to this invention, the magnitude size between vertebral bodies and a vertebral body (intervertebral space) can be maintained appropriately. Moreover, regardless of the case or the position between the vertebrae, the breakage can be prevented accurately, and early bone fusion with the vertebral body can be caused.本発明の椎体スペーサ１は、椎体１０１、１０２間（椎間）に挿入して使用される。この椎体スペーサ１は、各椎体１０１、１０２と当接する一対の当接面を備え、チタンまたはチタン合金を主材料として構成されるブロック体２を有している。ブロック体２は、両端部が針状をなす針状体４０と、厚さ方向に貫通する貫通孔２２を備え、少なくとも表面の空孔率が針状体４０の空孔率よりも大きい多孔部２１とを有し、針状体４０は、その両端部が各当接面から突出するように貫通孔２２に挿通され、これにより、前記両端部は、ブロック体２を椎間に固定する機能を発揮する突起部４１を構成する。本発明によれば、椎体と椎体との間（椎間）の大きさを適正に維持することができる。また、症例や椎間の位置によらず、その破損を的確に防止することができ、かつ椎体との早期の骨癒合を生じさせ得る。
