PROBLEM TO BE SOLVED: To provide a composite body that can promote the engraftment of osteoblast or the like, or that can both suppress bacterial adhesion and promote the engraftment of cells such as osteoblast or the like, and to provide a method for producing composite body.SOLUTION: Provided is a composite body comprising a base material containing at least one of a titanium and a titanium alloy, and an organic layer covering at least a part of the surface of the base material, and in which the organic layer contains a polymer having an oxyalkylene group and a phosphate group.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】骨芽細胞等の生着を促進することが可能な、又はバクテリアの付着抑制と、骨芽細胞等の細胞の生着促進と、を両立することが可能な複合体、及び複合体の製造方法を提供すること。【解決手段】チタン及びチタン合金の少なくとも一方を含む基材と、上記基材の表面の少なくとも一部を覆う有機層とを備え、上記有機層が、オキシアルキレン基及びホスフェート基を有する高分子を含有する、複合体を提供する。【選択図】図１
