To obtain a hollow fiber membrane for blood treatment, which has high membrane performance, allows for a reduction in false positives for leakage, has excellent anti-oxidation performance and blood compatibility, is low-risk in terms of elution of hydrophilic polymer and hollow fiber leakage, is easy to prime, and has high transmission performance stability in a harsh environment. A hollow fiber membrane for blood treatment, the hollow fiber membrane comprising a hydrophilic polymer, a polysulfone-based resin, and a fat-soluble vitamin, wherein: a hydrophilic polymer content (A), which is the mass ratio of the hydrophilic polymer with respect to the total mass of the hydrophilic polymer and the polysulfone-based resin in the entire hollow fiber membrane for blood treatment, is 3-10 mass% a hydrophilic polymer prevalence (B), which is the mass ratio of the hydrophilic polymer with respect to the total mass of the hydrophilic polymer and the polysulfone-based resin in an inner surface of the hollow fiber membrane for blood treatment, is 35-50 mass% and the fat-soluble vitamin prevalence in the entire surface of the hollow fiber membrane for blood treatment is 0.5-25 mg per 1g of the hollow fiber membrane.本發明提供一種血液處理用中空絲膜,其具有較高之膜性能,可降低洩漏誤檢測,抗氧化性能或血液相容性優異,親水性高分子之溶出或中空絲洩漏之風險較低,容易引發,且於嚴酷環境下之透過性能穩定性較高。一種血液處理用中空絲膜,其係含有親水性高分子、聚碸系樹脂及脂溶性維生素者,且血液處理用中空絲膜整體之親水性高分子之質量相對於親水性高分子及聚碸系樹脂之合計質量的比例、即親水性高分子含有率A為3質量%以上10質量%以下,血液處理用中空絲膜之內表面之親水性高分子之質量相對於親水性高分子及聚碸系樹脂之合計質量的比例、即親水性高分子之存在率B為35質量%以上50質量%以下,血液處理用中空絲膜之整個表面之脂溶性維生素之存在量於每1 g中空絲膜中為0.5 mg以上25 mg以下。1‧‧‧血液處理用中空絲膜1a‧‧‧第一流路2‧‧‧筒狀容器2a‧‧‧端口2b‧‧‧端口3a‧‧‧樹脂3b‧‧‧樹脂6a‧‧‧噴嘴6b‧‧‧噴嘴7a‧‧‧集管蓋7b‧‧‧集管蓋8‧‧‧空間10‧‧‧中空絲膜型血液處理裝置11‧‧‧第二流路Fa‧‧‧箭頭Fb‧‧‧箭頭
