PURPOSE: To provide a polarizable electrode which has small decrease in an internal resistance, is small in amount of coming-off powder, has a large electric capacity per unit volume and is manufactured easily and rapidly at low cost, and to provide glassy carbon-active carbon composite material which is suitable for manufacturing the electrode.

CONSTITUTION: Glassy carbon-active carbon composite material is made by baking a mixture of polycarbodiimide resin and active carbon in an unoxidizing atmosphere and compounding glass carbon derived from the polycarbodiimide resin and the active carbon. A method for manufacturing the material is as follows. A mixture of polycarbodiimide resin and active carbon is molded into an appropriate shape if necessary and the molded body is baked in an unoxidizing atmosphere. A polarizable electrode for an electric double layer capacitor is formed of the glassy carbon-active carbon composite material.