PURPOSE: To manufacture an activated carbon composition having high strength and superior adsorbing power by activating a porous body consisting of fine ceramic powder, synthetic polyvinyl acetal resin and a resin convertible into glassy carbon after calcination in a nonoxidizing atmosphere.

CONSTITUTION: A mixture of fine ceramic powder with PVA, phenolic resin and a pore forming material is reacted with a cross-linking agent such as formaldehyde, and the resulting polous body is combined with a resin convertible into glassy carbon by thermal decomposition such as phenolic resin to obtain a composite porous body having continuous pores and contg. 4W25wt% synthetic polyvinyl acetal resin such as polyvinyl formal, 70W90% fine ceramic powder and 5W25% resin convertible into glassy carbon. The composite porous body is calcied at ≥1,000°C in a nonoxidizing atmosphere and activated by heating to 500W 1,200°C in an atmosphere of steam or gaseous CO2 to obtain an activated carbon composition having high strength, superior adsorbing power and continuous pores.