The present invention is a composite gas adsorbent in which an amine and an acid are supported on a porous material, wherein the amine is particulate, and the particle diameter of all particles is 0.01 to 100 μm. The amine particles are supported on macropores having a diameter of 50 nm or more of the porous material and on the outer surface of the porous material, and the total amount of the amines supported is 0.06 to 0 with respect to the porous material. The present invention relates to a composite gas adsorbent having an amount (mass) of 5 times.本発明は、多孔質材料に、アミン類と酸類とを担持させた複合ガス吸着材であって、前記アミン類が粒子状で、かつ、全粒子の粒子径が０．０１～１００μｍであり、該アミン類の粒子が前記多孔質材料の直径５０ｎｍ以上のマクロ孔および前記多孔質材料の外表面に担持されており、前記アミン類の担持量が合計で多孔質材料に対し０．０６～０．５倍の量（質量）である、複合ガス吸着材に関する。
