PROBLEM TO BE SOLVED: To provide a bone stationary member which is embedded into a body and attached to bone, high in static strength of periphery of a fitting hole to which an attachment member for attaching the bone stationary member to the bone is inserted and high in fatigue strength.SOLUTION: There is provided a bone stationary member formed by a Ti alloy having a composition generally classified as a near α type and/or an α+β type and an inner peripheral surface of the fitting hole and a peripheral part thereof has percentage content of equal axis particles with particle diameter of less than 1 μm of 50 area% or more.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】体内に埋め込まれ、骨に取り付けられる骨固定部材であって、この骨固定部材を骨に取り付けるための取り付け部材が挿入される装着孔の周囲の静的強度が高く、かつ疲労強度が高い骨固定部材を提供する。【解決手段】ニアα型および／またはα＋β型に一般分類される組成をもつＴｉ合金で形成され、前記装着孔の内周面およびその周縁部は、粒径が１μｍ未満の等軸粒の含有率が面積率で５０％以上であることを特徴とする骨固定部材。【選択図】図２
