Disclosed is a purification column containing a porous fiber excellent in performance of removing a substance to be purified and an absorbent material in which the fiber is bundled. A porous fiber having a shape in which three or more fins are continuously present in the longitudinal direction on the outer periphery of a solid fiber, and satisfying the requirements of (a) and (b) below. (A) In the cross section, if the diameter of the inscribed circle is Di and the diameter of the circumscribed circle is Do, the irregularity Do / Di is 1.2 to 6.6 (b) The specific surface area of the pore is 50 m 2 / g or more被浄化物質除去性能に優れた多孔質の繊維および該繊維を束として吸着材料としたものを内蔵した浄化カラムを提供する。 中実の繊維の外周部に３個以上のフィンが長手方向に連続して存在する形状を有し、以下（ａ）及び（ｂ）の要件を満たす、多孔質繊維。（ａ）横断面において、内接円の直径をＤｉ、外接円の直径をＤｏとすると、 異形度Ｄｏ／Ｄｉが１．２～６．６（ｂ）細孔の比表面積が５０ｍ２／ｇ以上
