A polyethylene resin porous hollow fiber membrane having a plurality of microfibrils which include a polyethylene resin and which are aligned in the fiber longitudinal direction, and nodular parts comprising a lamellar laminate connected to both ends of the microfibrils, wherein the mass fraction of components having a molecular weight of 10,000 or less is 17.5 mass% or above, and the mass fraction of components having a molecular weight of 1,000,000 or higher is less than 1.5 mass%.本發明係一種聚乙烯系樹脂多孔質中空絲膜，其係包含聚乙烯系樹脂，且具有於絲長方向配向之複數種微纖維及連結於該微纖維之兩端之包含片狀積層體之結節部者，分子量為10000以下之成分之質量分率為17.5質量%以上，且分子量為100萬以上之成分之質量分率為未達1.5質量%。
