An object of the present invention is to provide an artificial lung which can effectively reduce the filling amount of blood and can satisfactorily exhibit the function of the artificial lung. The artificial lung (100) of the present invention comprises a filling section (110) communicating with an inflow port (101) and an outflow port (102) of a blood and filled with blood, a bundle of a plurality of heat exchange hollow fibers A heat exchanging part provided in the packing part and provided in the packing part, a gas exchanging part including a bundle of a plurality of gas exchange hollow fibers and provided in the filling part so as to be adjacent to the heat exchanging part, And a porous member (180) disposed in a gap (190) between the heat exchanging portion and the gas exchanging portion to fill the gap.本発明は、血液の充填量を効果的に削減し、かつ人工肺の機能を良好に発揮できる人工肺を提供することを目的とする。 本発明の人工肺(100)は、血液の流入口(101)および流出口(102)と連通し血液が充填される充填部(110)と、複数の熱交換用中空糸(163)の束を含み充填部内に備えられた熱交換部(160)と、複数のガス交換用中空糸(173)の束を含み充填部内に熱交換部と隣り合うように備えられたガス交換部(170)と、熱交換部とガス交換部との間の隙間(190)に配置され当該隙間を埋める多孔部材(180)と、を有する。
